diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..f1299d1
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,1362 @@
+#!/bin/sh
+
+set -eu
+
+similar()
+{
+	psnr=$(compare -metric PSNR "$1" "$2" null: 2>&1 || true)
+	if [ -z "$psnr" ]; then
+		echo "compare failed"
+		return 1
+	fi
+
+	# PSNR of zero means that they are identical
+	if [ "$psnr" = 0 ]; then
+		echo "images are equal -- don't use similar() but require exactness"
+		exit 2
+	fi
+
+	# The lower PSNR value, the fewer the similarities
+	# The lowest (and worst) value is 1.0
+	min_psnr=50
+	if [ "$min_psnr" != "$( printf "$psnr\n$min_psnr\n" | sort --general-numeric-sort | head --lines=1)" ]; then
+		echo "pdf wrongly rendered"
+		return 1
+	fi
+	return 0
+}
+
+compare_rendered()
+{
+	pdf="$1"
+	img="$2"
+	gsdevice=png16m
+	if [ "$#" -eq 3 ]; then
+		gsdevice="$3"
+	fi
+
+	compare_ghostscript "$pdf" "$img" "$gsdevice"
+
+	compare_poppler "$pdf" "$img"
+
+	compare_mupdf "$pdf" "$img"
+}
+
+compare_ghostscript()
+{
+	pdf="$1"
+	img="$2"
+	gsdevice="$3"
+	gs -dQUIET -dNOPAUSE -dBATCH -sDEVICE="$gsdevice" -r96 -sOutputFile="$tempdir/gs-%00d.png" "$pdf"
+	compare -metric AE "$img" "$tempdir/gs-1.png" null: 2>/dev/null
+	rm "$tempdir/gs-1.png"
+}
+
+compare_poppler()
+{
+	pdf="$1"
+	img="$2"
+	pdftocairo -r 96 -png "$pdf" "$tempdir/poppler"
+	compare -metric AE "$img" "$tempdir/poppler-1.png" null: 2>/dev/null
+	rm "$tempdir/poppler-1.png"
+}
+
+compare_mupdf()
+{
+	pdf="$1"
+	img="$2"
+	mutool draw -o "$tempdir/mupdf.png" -r 96 "$pdf" 2>/dev/null
+	compare -metric AE "$img" "$tempdir/mupdf.png" null: 2>/dev/null
+	rm "$tempdir/mupdf.png"
+}
+
+compare_pdfimages()
+{
+	pdf="$1"
+	img="$2"
+	pdfimages -png "$pdf" "$tempdir/images"
+	compare -metric AE "$img" "$tempdir/images-000.png" null: 2>/dev/null
+	rm "$tempdir/images-000.png"
+}
+
+tempdir=$(mktemp --directory --tmpdir img2pdf.XXXXXXXXXX)
+
+# we use -strip to remove all timestamps (tIME chunk and exif data)
+convert -size 60x60 \( xc:none -fill red -draw 'circle 30,21 30,3' -gaussian-blur 0x3 \) \
+	\( \( xc:none -fill lime -draw 'circle 39,39 36,57' -gaussian-blur 0x3 \) \
+	   \( xc:none -fill blue -draw 'circle 21,39 24,57' -gaussian-blur 0x3 \) \
+	   -compose plus -composite \
+	\) -compose plus -composite \
+	-strip \
+	"$tempdir/alpha.png"
+
+convert "$tempdir/alpha.png" -background black -alpha remove -alpha off -strip "$tempdir/normal16.png"
+
+convert "$tempdir/normal16.png" -depth 8 -strip "$tempdir/normal.png"
+
+convert "$tempdir/normal.png" -negate -strip "$tempdir/inverse.png"
+
+convert "$tempdir/normal16.png" -colorspace Gray -depth 16 -strip "$tempdir/gray16.png"
+convert "$tempdir/normal16.png" -colorspace Gray -dither FloydSteinberg -colors 256 -depth 8 -strip "$tempdir/gray8.png"
+convert "$tempdir/normal16.png" -colorspace Gray -dither FloydSteinberg -colors 16 -depth 4 -strip "$tempdir/gray4.png"
+convert "$tempdir/normal16.png" -colorspace Gray -dither FloydSteinberg -colors 4 -depth 2 -strip "$tempdir/gray2.png"
+convert "$tempdir/normal16.png" -colorspace Gray -dither FloydSteinberg -colors 2 -depth 1 -strip "$tempdir/gray1.png"
+
+# use "-define png:exclude-chunk=bkgd" because otherwise, imagemagick will
+# add the background color (white) as an additional entry to the palette
+convert "$tempdir/normal.png" -dither FloydSteinberg -colors 2 -define png:exclude-chunk=bkgd -strip "$tempdir/palette1.png"
+convert "$tempdir/normal.png" -dither FloydSteinberg -colors 4 -define png:exclude-chunk=bkgd -strip "$tempdir/palette2.png"
+convert "$tempdir/normal.png" -dither FloydSteinberg -colors 16 -define png:exclude-chunk=bkgd -strip "$tempdir/palette4.png"
+convert "$tempdir/normal.png" -dither FloydSteinberg -colors 256 -define png:exclude-chunk=bkgd -strip "$tempdir/palette8.png"
+
+cat << END | ( cd "$tempdir"; md5sum --check --status - )
+a99ef2a356c315090b6939fa4ce70516  alpha.png
+0df21ebbce5292654119b17f6e52bc81  gray16.png
+6faee81b8db446caa5004ad71bddcb5b  gray1.png
+97e423da517ede069348484a1283aa6c  gray2.png
+cbed1b6da5183aec0b86909e82b77c41  gray4.png
+c0df42fdd69ae2a16ad0c23adb39895e  gray8.png
+ac6bb850fb5aaee9fa7dcb67525cd0fc  inverse.png
+3f3f8579f5054270e79a39e7cc4e89e0  normal16.png
+cbe63b21443af8321b213bde6666951f  normal.png
+2f00705cca05fd94406fc39ede4d7322  palette1.png
+6cb250d1915c2af99c324c43ff8286eb  palette2.png
+ab7b3d3907a851692ee36f5349ed0b2c  palette4.png
+03829af4af8776adf56ba2e68f5b111e  palette8.png
+END
+
+# use img2pdfprog environment variable if it is set
+if [ -z ${img2pdfprog+x} ]; then
+	img2pdfprog=src/img2pdf.py
+fi
+
+img2pdf()
+{
+	# we use --without-pdfrw to better "grep" the result and because we
+	# cannot write palette based images otherwise
+	$img2pdfprog --without-pdfrw --producer="" --nodate "$1" > "$2" 2>/dev/null
+}
+
+tests=49 # number of tests
+j=1      # current test
+
+###############################################################################
+echo "Test $j/$tests JPEG"
+
+convert "$tempdir/normal.png" "$tempdir/normal.jpg"
+
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Format: JPEG (Joint Photographic Experts Group JFIF format)$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Mime type: image/jpeg$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Compression: JPEG$'
+
+img2pdf "$tempdir/normal.jpg" "$tempdir/out.pdf"
+
+# We have to use jpegtopnm with the original JPG before being able to compare
+# it with imagemagick because imagemagick will decode the JPG slightly
+# differently than ghostscript, poppler and mupdf do it.
+# We have to use jpegtopnm and cannot use djpeg because the latter produces
+# slightly different results as well when called like this:
+#    djpeg -dct int -pnm "$tempdir/normal.jpg" > "$tempdir/normal.pnm"
+jpegtopnm -dct int "$tempdir/normal.jpg" > "$tempdir/normal.pnm" 2>/dev/null
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/normal.pnm"
+
+pdfimages -j "$tempdir/out.pdf" "$tempdir/images"
+cmp "$tempdir/normal.jpg" "$tempdir/images-000.jpg"
+rm "$tempdir/images-000.jpg"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceRGB$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /DCTDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/normal.jpg" "$tempdir/normal.pnm" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests JPEG CMYK"
+
+convert "$tempdir/normal.png" -colorspace cmyk "$tempdir/normal.jpg"
+
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Format: JPEG (Joint Photographic Experts Group JFIF format)$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Mime type: image/jpeg$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Colorspace: CMYK$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Type: ColorSeparation$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.jpg" | grep --quiet '^  Compression: JPEG$'
+
+img2pdf "$tempdir/normal.jpg" "$tempdir/out.pdf"
+
+gs -dQUIET -dNOPAUSE -dBATCH -sDEVICE=tiff32nc -r96 -sOutputFile="$tempdir/gs-%00d.tiff" "$tempdir/out.pdf"
+similar "$tempdir/normal.jpg" "$tempdir/gs-1.tiff"
+rm "$tempdir/gs-1.tiff"
+
+# not testing with poppler as it cannot write CMYK images
+
+mutool draw -o "$tempdir/mupdf.pam" -r 96 -c cmyk "$pdf" 2>/dev/null
+similar "$tempdir/normal.jpg" "$tempdir/mupdf.pam"
+rm "$tempdir/mupdf.pam"
+
+pdfimages -j "$tempdir/out.pdf" "$tempdir/images"
+cmp "$tempdir/normal.jpg" "$tempdir/images-000.jpg"
+rm "$tempdir/images-000.jpg"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceCMYK$' "$tempdir/out.pdf"
+grep --quiet '^    /Decode \[ 1 0 1 0 1 0 1 0 \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /DCTDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/normal.jpg" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests JPEG2000"
+
+convert "$tempdir/normal.png" "$tempdir/normal.jp2"
+
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Format: JP2 (JPEG-2000 File Format Syntax)$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Mime type: image/jp2$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.jp2" | grep --quiet '^  Compression: JPEG2000$'
+
+img2pdf "$tempdir/normal.jp2" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/normal.jp2"
+
+pdfimages -jp2 "$tempdir/out.pdf" "$tempdir/images"
+cmp "$tempdir/normal.jp2" "$tempdir/images-000.jp2"
+rm "$tempdir/images-000.jp2"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceRGB$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /JPXDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/normal.jp2" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+#echo Test JPEG2000 CMYK
+#
+# cannot test because imagemagick does not support JPEG2000 CMYK
+
+###############################################################################
+echo "Test $j/$tests PNG RGB8"
+
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 8$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^    png:IHDR.bit_depth: 8$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^    png:IHDR.color-type-orig: 2$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^    png:IHDR.color_type: 2 (Truecolor)$'
+identify -verbose "$tempdir/normal.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/normal.png" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/normal.png"
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/normal.png"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceRGB$' "$tempdir/out.pdf"
+grep --quiet '^        /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^        /Colors 3$' "$tempdir/out.pdf"
+grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests PNG RGB16"
+
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Depth: 16-bit$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 16$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^    png:IHDR.bit_depth: 16$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^    png:IHDR.color-type-orig: 2$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^    png:IHDR.color_type: 2 (Truecolor)$'
+identify -verbose "$tempdir/normal16.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/normal16.png" "$tempdir/out.pdf"
+
+compare_ghostscript "$tempdir/out.pdf" "$tempdir/normal16.png" tiff48nc
+
+# poppler outputs 8-bit RGB so the comparison will not be exact
+pdftocairo -r 96 -png "$tempdir/out.pdf" "$tempdir/poppler"
+similar "$tempdir/normal16.png" "$tempdir/poppler-1.png"
+rm "$tempdir/poppler-1.png"
+
+# pdfimages is unable to write 16 bit output
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 16$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceRGB$' "$tempdir/out.pdf"
+grep --quiet '^        /BitsPerComponent 16$' "$tempdir/out.pdf"
+grep --quiet '^        /Colors 3$' "$tempdir/out.pdf"
+grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests PNG RGBA8"
+
+convert "$tempdir/alpha.png" -depth 8 -strip "$tempdir/alpha8.png"
+
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Type: TrueColorAlpha$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 8$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^    png:IHDR.bit_depth: 8$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^    png:IHDR.color-type-orig: 6$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^    png:IHDR.color_type: 6 (RGBA)$'
+identify -verbose "$tempdir/alpha8.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/alpha8.png" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/alpha8.png"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests PNG RGBA16"
+
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Type: TrueColorAlpha$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Depth: 16-bit$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 16$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^    png:IHDR.bit_depth: 16$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^    png:IHDR.color-type-orig: 6$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^    png:IHDR.color_type: 6 (RGBA)$'
+identify -verbose "$tempdir/alpha.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/alpha.png" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests PNG Gray8 Alpha"
+
+convert "$tempdir/alpha.png" -colorspace Gray -dither FloydSteinberg -colors 256 -depth 8 -strip "$tempdir/alpha_gray8.png"
+
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Colorspace: Gray$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Type: GrayscaleAlpha$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 8$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^    png:IHDR.bit_depth: 8$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^    png:IHDR.color-type-orig: 4$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^    png:IHDR.color_type: 4 (GrayAlpha)$'
+identify -verbose "$tempdir/alpha_gray8.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/alpha_gray8.png" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/alpha_gray8.png"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests PNG Gray16 Alpha"
+
+convert "$tempdir/alpha.png" -colorspace Gray -depth 16 -strip "$tempdir/alpha_gray16.png"
+
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Colorspace: Gray$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Type: GrayscaleAlpha$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Depth: 16-bit$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 16$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^    png:IHDR.bit_depth: 16$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^    png:IHDR.color-type-orig: 4$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^    png:IHDR.color_type: 4 (GrayAlpha)$'
+identify -verbose "$tempdir/alpha_gray16.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/alpha_gray16.png" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/alpha_gray16.png"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests PNG interlaced"
+
+convert "$tempdir/normal.png" -interlace PNG -strip "$tempdir/interlace.png"
+
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 8$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^    png:IHDR.bit_depth: 8$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^    png:IHDR.color-type-orig: 2$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^    png:IHDR.color_type: 2 (Truecolor)$'
+identify -verbose "$tempdir/interlace.png" | grep --quiet '^    png:IHDR.interlace_method: 1 (Adam7 method)$'
+
+img2pdf "$tempdir/interlace.png" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/normal.png"
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/normal.png"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceRGB$' "$tempdir/out.pdf"
+grep --quiet '^        /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^        /Colors 3$' "$tempdir/out.pdf"
+grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/interlace.png" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+for i in 1 2 4 8; do
+	echo "Test $j/$tests PNG Gray$i"
+
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Mime type: image/png$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Colorspace: Gray$'
+	if [ "$i" -eq 1 ]; then
+		identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Type: Bilevel$'
+	else
+		identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Type: Grayscale$'
+	fi
+	if [ "$i" -eq 8 ]; then
+		identify -verbose "$tempdir/gray$i.png" | grep --quiet "^  Depth: 8-bit$"
+	else
+		identify -verbose "$tempdir/gray$i.png" | grep --quiet "^  Depth: 8/$i-bit$"
+	fi
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^  Compression: Zip$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet "^    png:IHDR.bit-depth-orig: $i$"
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet "^    png:IHDR.bit_depth: $i$"
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^    png:IHDR.color-type-orig: 0$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^    png:IHDR.color_type: 0 (Grayscale)$'
+	identify -verbose "$tempdir/gray$i.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+	img2pdf "$tempdir/gray$i.png" "$tempdir/out.pdf"
+
+	compare_rendered "$tempdir/out.pdf" "$tempdir/gray$i.png" pnggray
+
+	compare_pdfimages "$tempdir/out.pdf" "$tempdir/gray$i.png"
+
+	grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+	grep --quiet '^    /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+	grep --quiet '^        /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^        /Colors 1$' "$tempdir/out.pdf"
+	grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+	grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+	grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+	grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+	rm "$tempdir/out.pdf"
+	j=$((j+1))
+done
+
+###############################################################################
+echo "Test $j/$tests PNG Gray16"
+
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Mime type: image/png$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Colorspace: Gray$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Type: Grayscale$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Depth: 16-bit$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^    png:IHDR.bit-depth-orig: 16$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^    png:IHDR.bit_depth: 16$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^    png:IHDR.color-type-orig: 0$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^    png:IHDR.color_type: 0 (Grayscale)$'
+identify -verbose "$tempdir/gray16.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+img2pdf "$tempdir/gray16.png" "$tempdir/out.pdf"
+
+# ghostscript outputs 8-bit grayscale, so the comparison will not be exact
+gs -dQUIET -dNOPAUSE -dBATCH -sDEVICE=pnggray -r96 -sOutputFile="$tempdir/gs-%00d.png" "$tempdir/out.pdf"
+similar "$tempdir/gray16.png" "$tempdir/gs-1.png"
+rm "$tempdir/gs-1.png"
+
+# poppler outputs 8-bit grayscale so the comparison will not be exact
+pdftocairo -r 96 -png "$tempdir/out.pdf" "$tempdir/poppler"
+similar "$tempdir/gray16.png" "$tempdir/poppler-1.png"
+rm "$tempdir/poppler-1.png"
+
+# pdfimages outputs 8-bit grayscale so the comparison will not be exact
+pdfimages -png "$tempdir/out.pdf" "$tempdir/images"
+similar "$tempdir/gray16.png" "$tempdir/images-000.png"
+rm "$tempdir/images-000.png"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 16$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BitsPerComponent 16$' "$tempdir/out.pdf"
+grep --quiet '^        /Colors 1$' "$tempdir/out.pdf"
+grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+for i in 1 2 4 8; do
+	echo "Test $j/$tests PNG Palette$i"
+
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Format: PNG (Portable Network Graphics)$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Mime type: image/png$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Colorspace: sRGB$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Type: Palette$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Depth: 8-bit$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Page geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^  Compression: Zip$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet "^    png:IHDR.bit-depth-orig: $i$"
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet "^    png:IHDR.bit_depth: $i$"
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^    png:IHDR.color-type-orig: 3$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^    png:IHDR.color_type: 3 (Indexed)$'
+	identify -verbose "$tempdir/palette$i.png" | grep --quiet '^    png:IHDR.interlace_method: 0 (Not interlaced)$'
+
+	img2pdf "$tempdir/palette$i.png" "$tempdir/out.pdf"
+
+	compare_rendered "$tempdir/out.pdf" "$tempdir/palette$i.png"
+
+	# pdfimages cannot export palette based images
+
+	grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+	grep --quiet '^    /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^    /ColorSpace \[ /Indexed /DeviceRGB ' "$tempdir/out.pdf"
+	grep --quiet '^        /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^        /Colors 1$' "$tempdir/out.pdf"
+	grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+	grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+	grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+	grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+	rm "$tempdir/out.pdf"
+	j=$((j+1))
+done
+
+###############################################################################
+echo "Test $j/$tests GIF transparent"
+
+convert "$tempdir/alpha.png" "$tempdir/alpha.gif"
+
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Format: GIF (CompuServe graphics interchange format)$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Mime type: image/gif$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Type: PaletteAlpha$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Colormap entries: 256$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha.gif" | grep --quiet '^  Compression: LZW$'
+
+img2pdf "$tempdir/alpha.gif" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/alpha.gif"
+j=$((j+1))
+
+###############################################################################
+for i in 1 2 4 8; do
+	echo "Test $j/$tests GIF Palette$i"
+
+	convert "$tempdir/palette$i.png" "$tempdir/palette$i.gif"
+
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Format: GIF (CompuServe graphics interchange format)$'
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Mime type: image/gif$'
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Colorspace: sRGB$'
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Type: Palette$'
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Depth: 8-bit$'
+	case $i in
+		1) identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Colormap entries: 2$';;
+		2) identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Colormap entries: 4$';;
+		4) identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Colormap entries: 16$';;
+		8) identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Colormap entries: 256$';;
+	esac
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Page geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/palette$i.gif" | grep --quiet '^  Compression: LZW$'
+
+	img2pdf "$tempdir/palette$i.gif" "$tempdir/out.pdf"
+
+	compare_rendered "$tempdir/out.pdf" "$tempdir/palette$i.png"
+
+	# pdfimages cannot export palette based images
+
+	grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+	grep --quiet '^    /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^    /ColorSpace \[ /Indexed /DeviceRGB ' "$tempdir/out.pdf"
+	grep --quiet '^        /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^        /Colors 1$' "$tempdir/out.pdf"
+	grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+	grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+	grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+	grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+	rm "$tempdir/out.pdf" "$tempdir/palette$i.gif"
+	j=$((j+1))
+done
+
+###############################################################################
+echo "Test $j/$tests GIF animation"
+
+convert "$tempdir/normal.png" "$tempdir/inverse.png" -strip "$tempdir/animation.gif"
+
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Format: GIF (CompuServe graphics interchange format)$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Mime type: image/gif$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Type: Palette$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Colormap entries: 256$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/animation.gif[0]" | grep --quiet '^  Compression: LZW$'
+
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Format: GIF (CompuServe graphics interchange format)$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Mime type: image/gif$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Type: Palette$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Colormap entries: 256$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Compression: LZW$'
+identify -verbose "$tempdir/animation.gif[1]" | grep --quiet '^  Scene: 1$'
+
+img2pdf "$tempdir/animation.gif" "$tempdir/out.pdf"
+
+if [ "$(pdfinfo "$tempdir/out.pdf" | awk '/Pages:/ {print $2}')" != 2 ]; then
+	echo "pdf does not have 2 pages"
+	exit 1
+fi
+
+pdfseparate "$tempdir/out.pdf" "$tempdir/page-%d.pdf"
+rm "$tempdir/out.pdf"
+
+for page in 1 2; do
+	compare_rendered "$tempdir/page-$page.pdf" "$tempdir/animation.gif[$((page-1))]"
+
+	# pdfimages cannot export palette based images
+
+	# We cannot grep the PDF metadata here, because the page was
+	# rewritten into a non-greppable format by pdfseparate. but that's
+	# okay, because we already grepped single pages before and multipage
+	# PDF should not be different.
+
+	rm "$tempdir/page-$page.pdf"
+done
+
+rm "$tempdir/animation.gif"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF float"
+
+convert "$tempdir/normal.png" -depth 32 -define quantum:format=floating-point "$tempdir/float.tiff"
+
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Depth: 32/8-bit$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^    quantum:format: floating-point$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/float.tiff" | grep --quiet '^    tiff:photometric: RGB$'
+
+img2pdf "$tempdir/float.tiff" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/float.tiff"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF CMYK8"
+
+convert "$tempdir/normal.png" -colorspace cmyk "$tempdir/cmyk8.tiff"
+
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Colorspace: CMYK$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Type: ColorSeparation$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/cmyk8.tiff" | grep --quiet '^    tiff:photometric: separated$'
+
+img2pdf "$tempdir/cmyk8.tiff" "$tempdir/out.pdf"
+
+compare_ghostscript "$tempdir/out.pdf" "$tempdir/cmyk8.tiff" tiff32nc
+
+# not testing with poppler as it cannot write CMYK images
+
+mutool draw -o "$tempdir/mupdf.pam" -r 96 -c cmyk "$pdf" 2>/dev/null
+compare -metric AE "$tempdir/cmyk8.tiff" "$tempdir/mupdf.pam" null: 2>/dev/null
+rm "$tempdir/mupdf.pam"
+
+pdfimages -tiff "$tempdir/out.pdf" "$tempdir/images"
+compare -metric AE "$tempdir/cmyk8.tiff" "$tempdir/images-000.tif" null: 2>/dev/null
+rm "$tempdir/images-000.tif"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceCMYK$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/cmyk8.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF CMYK16"
+
+convert "$tempdir/normal.png" -depth 16 -colorspace cmyk "$tempdir/cmyk16.tiff"
+
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Colorspace: CMYK$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Type: ColorSeparation$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Depth: 16-bit$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/cmyk16.tiff" | grep --quiet '^    tiff:photometric: separated$'
+
+# PIL is unable to read 16 bit CMYK images
+img2pdf "$tempdir/cmyk16.gif" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/cmyk16.tiff"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF RGB8"
+
+convert "$tempdir/normal.png" "$tempdir/normal.tiff"
+
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/normal.tiff" | grep --quiet '^    tiff:photometric: RGB$'
+
+img2pdf "$tempdir/normal.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/normal.tiff" tiff24nc
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/normal.tiff"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceRGB$' "$tempdir/out.pdf"
+grep --quiet '^        /BitsPerComponent 8$' "$tempdir/out.pdf"
+grep --quiet '^        /Colors 3$' "$tempdir/out.pdf"
+grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/normal.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF RGBA8"
+
+convert "$tempdir/alpha.png" -depth 8 -strip "$tempdir/alpha8.tiff"
+
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Type: TrueColorAlpha$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^    tiff:alpha: unassociated$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/alpha8.tiff" | grep --quiet '^    tiff:photometric: RGB$'
+
+img2pdf "$tempdir/alpha8.tiff" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/alpha8.tiff"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF RGBA16"
+
+convert "$tempdir/alpha.png" -strip "$tempdir/alpha16.tiff"
+
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Type: TrueColorAlpha$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Depth: 16-bit$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^    tiff:alpha: unassociated$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/alpha16.tiff" | grep --quiet '^    tiff:photometric: RGB$'
+
+img2pdf "$tempdir/alpha16.tiff" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/alpha16.tiff"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF Gray1"
+
+convert "$tempdir/gray1.png" -depth 1 "$tempdir/gray1.tiff"
+
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Colorspace: Gray$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Type: Bilevel$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Depth: 1-bit$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/gray1.tiff" | grep --quiet '^    tiff:photometric: min-is-black$'
+
+img2pdf "$tempdir/gray1.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/gray1.png" pnggray
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/gray1.png"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 1$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BlackIs1 true$' "$tempdir/out.pdf"
+grep --quiet '^        /Columns 60$' "$tempdir/out.pdf"
+grep --quiet '^        /K -1$' "$tempdir/out.pdf"
+grep --quiet '^        /Rows 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter \[ /CCITTFaxDecode \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/gray1.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+for i in 2 4 8; do
+	echo "Test $j/$tests TIFF Gray$i"
+
+	convert "$tempdir/gray$i.png" -depth $i "$tempdir/gray$i.tiff"
+
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Mime type: image/tiff$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Colorspace: Gray$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Type: Grayscale$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Endianess: LSB$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet "^  Depth: $i-bit$"
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^  Compression: Zip$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^    tiff:endian: lsb$'
+	identify -verbose "$tempdir/gray$i.tiff" | grep --quiet '^    tiff:photometric: min-is-black$'
+
+	img2pdf "$tempdir/gray$i.tiff" "$tempdir/out.pdf"
+
+	compare_rendered "$tempdir/out.pdf" "$tempdir/gray$i.png" pnggray
+
+	compare_pdfimages "$tempdir/out.pdf" "$tempdir/gray$i.png"
+
+	# When saving a PNG, PIL will store it as 8-bit data
+	grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+	grep --quiet '^    /BitsPerComponent 8$' "$tempdir/out.pdf"
+	grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+	grep --quiet '^        /BitsPerComponent 8$' "$tempdir/out.pdf"
+	grep --quiet '^        /Colors 1$' "$tempdir/out.pdf"
+	grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+	grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+	grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+	grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+	rm "$tempdir/gray$i.tiff" "$tempdir/out.pdf"
+	j=$((j+1))
+done
+
+################################################################################
+echo "Test $j/$tests TIFF Gray16"
+
+convert "$tempdir/gray16.png" -depth 16 "$tempdir/gray16.tiff"
+
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Colorspace: Gray$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Type: Grayscale$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet "^  Depth: 16-bit$"
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/gray16.tiff" | grep --quiet '^    tiff:photometric: min-is-black$'
+
+img2pdf "$tempdir/gray16.tiff" /dev/null && rc=$? || rc=$?
+if [ "$rc" -eq 0 ]; then
+	echo needs to fail here
+	exit 1
+fi
+
+rm "$tempdir/gray16.tiff"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF multipage"
+
+convert "$tempdir/normal.png" "$tempdir/inverse.png" -strip "$tempdir/multipage.tiff"
+
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/multipage.tiff[0]" | grep --quiet '^    tiff:photometric: RGB$'
+
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Mime type: image/tiff$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Geometry: 60x60+0+0$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Colorspace: sRGB$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Type: TrueColor$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Endianess: LSB$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Depth: 8-bit$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Page geometry: 60x60+0+0$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Compression: Zip$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^    tiff:alpha: unspecified$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^    tiff:endian: lsb$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^    tiff:photometric: RGB$'
+identify -verbose "$tempdir/multipage.tiff[1]" | grep --quiet '^  Scene: 1$'
+
+img2pdf "$tempdir/multipage.tiff" "$tempdir/out.pdf"
+
+if [ "$(pdfinfo "$tempdir/out.pdf" | awk '/Pages:/ {print $2}')" != 2 ]; then
+	echo "pdf does not have 2 pages"
+	exit 1
+fi
+
+pdfseparate "$tempdir/out.pdf" "$tempdir/page-%d.pdf"
+rm "$tempdir/out.pdf"
+
+for page in 1 2; do
+	compare_rendered "$tempdir/page-$page.pdf" "$tempdir/multipage.tiff[$((page-1))]"
+
+	compare_pdfimages "$tempdir/page-$page.pdf" "$tempdir/multipage.tiff[$((page-1))]"
+
+	# We cannot grep the PDF metadata here, because the page was
+	# rewritten into a non-greppable format by pdfseparate. but that's
+	# okay, because we already grepped single pages before and multipage
+	# PDF should not be different.
+
+	rm "$tempdir/page-$page.pdf"
+done
+
+rm "$tempdir/multipage.tiff"
+j=$((j+1))
+
+###############################################################################
+for i in 1 2 4 8; do
+	echo "Test $j/$tests TIFF Palette$i"
+
+	convert "$tempdir/palette$i.png" "$tempdir/palette$i.tiff"
+
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Mime type: image/tiff$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Colorspace: sRGB$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Type: Palette$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Endianess: LSB$'
+	if [ "$i" -eq 8 ]; then
+		identify -verbose "$tempdir/palette$i.tiff" | grep --quiet "^  Depth: 8-bit$"
+	else
+		identify -verbose "$tempdir/palette$i.tiff" | grep --quiet "^  Depth: $i/8-bit$"
+	fi
+	case $i in
+		1) identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Colormap entries: 2$';;
+		2) identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Colormap entries: 4$';;
+		4) identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Colormap entries: 16$';;
+		8) identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Colormap entries: 256$';;
+	esac
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^  Compression: Zip$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^    tiff:endian: lsb$'
+	identify -verbose "$tempdir/palette$i.tiff" | grep --quiet '^    tiff:photometric: palette$'
+
+	img2pdf "$tempdir/palette$i.tiff" "$tempdir/out.pdf"
+
+	compare_rendered "$tempdir/out.pdf" "$tempdir/palette$i.png"
+
+	# pdfimages cannot export palette based images
+
+	grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+	grep --quiet '^    /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^    /ColorSpace \[ /Indexed /DeviceRGB ' "$tempdir/out.pdf"
+	grep --quiet '^        /BitsPerComponent '"$i"'$' "$tempdir/out.pdf"
+	grep --quiet '^        /Colors 1$' "$tempdir/out.pdf"
+	grep --quiet '^        /Predictor 15$' "$tempdir/out.pdf"
+	grep --quiet '^    /Filter /FlateDecode$' "$tempdir/out.pdf"
+	grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+	grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+	rm "$tempdir/out.pdf"
+
+	rm "$tempdir/palette$i.tiff"
+	j=$((j+1))
+done
+
+###############################################################################
+for i in 12 14 16; do
+	echo "Test $j/$tests TIFF RGB$i"
+
+	convert "$tempdir/normal16.png" -depth "$i" "$tempdir/normal$i.tiff"
+
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Format: TIFF (Tagged Image File Format)$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Mime type: image/tiff$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Colorspace: sRGB$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Type: TrueColor$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Endianess: LSB$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet "^  Depth: $i-bit$"
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Page geometry: 60x60+0+0$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^  Compression: Zip$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^    tiff:alpha: unspecified$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^    tiff:endian: lsb$'
+	identify -verbose "$tempdir/normal$i.tiff" | grep --quiet '^    tiff:photometric: RGB$'
+
+	img2pdf "$tempdir/normal$i.tiff" /dev/null && rc=$? || rc=$?
+	if [ "$rc" -eq 0 ]; then
+		echo needs to fail here
+		exit 1
+	fi
+
+	rm "$tempdir/normal$i.tiff"
+	j=$((j+1))
+done
+
+###############################################################################
+echo "Test $j/$tests TIFF CCITT Group4, little endian, msb-to-lsb, min-is-white"
+
+convert "$tempdir/gray1.png" -compress group4 -define tiff:endian=lsb -define tiff:fill-order=msb -define quantum:polarity=min-is-white "$tempdir/group4.tiff"
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Bits/Sample: 1'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Compression Scheme: CCITT Group 4'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Photometric Interpretation: min-is-white'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'FillOrder: msb-to-lsb'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Samples/Pixel: 1'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Type: Bilevel'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Endianess: LSB'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Depth: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'gray: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Compression: Group4'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:endian: lsb'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:photometric: min-is-white'
+
+img2pdf "$tempdir/group4.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/group4.tiff" pnggray
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/group4.tiff"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 1$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BlackIs1 false$' "$tempdir/out.pdf"
+grep --quiet '^        /Columns 60$' "$tempdir/out.pdf"
+grep --quiet '^        /K -1$' "$tempdir/out.pdf"
+grep --quiet '^        /Rows 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter \[ /CCITTFaxDecode \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/group4.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF CCITT Group4, big endian, msb-to-lsb, min-is-white"
+
+convert "$tempdir/gray1.png" -compress group4 -define tiff:endian=msb -define tiff:fill-order=msb -define quantum:polarity=min-is-white "$tempdir/group4.tiff"
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Bits/Sample: 1'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Compression Scheme: CCITT Group 4'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Photometric Interpretation: min-is-white'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'FillOrder: msb-to-lsb'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Samples/Pixel: 1'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Type: Bilevel'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Endianess: MSB'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Depth: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'gray: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Compression: Group4'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:endian: msb'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:photometric: min-is-white'
+
+img2pdf "$tempdir/group4.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/group4.tiff" pnggray
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/group4.tiff"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 1$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BlackIs1 false$' "$tempdir/out.pdf"
+grep --quiet '^        /Columns 60$' "$tempdir/out.pdf"
+grep --quiet '^        /K -1$' "$tempdir/out.pdf"
+grep --quiet '^        /Rows 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter \[ /CCITTFaxDecode \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/group4.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF CCITT Group4, big endian, lsb-to-msb, min-is-white"
+
+convert "$tempdir/gray1.png" -compress group4 -define tiff:endian=msb -define tiff:fill-order=lsb -define quantum:polarity=min-is-white "$tempdir/group4.tiff"
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Bits/Sample: 1'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Compression Scheme: CCITT Group 4'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Photometric Interpretation: min-is-white'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'FillOrder: lsb-to-msb'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Samples/Pixel: 1'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Type: Bilevel'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Endianess: MSB'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Depth: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'gray: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Compression: Group4'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:endian: msb'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:photometric: min-is-white'
+
+img2pdf "$tempdir/group4.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/group4.tiff" pnggray
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/group4.tiff"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 1$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BlackIs1 false$' "$tempdir/out.pdf"
+grep --quiet '^        /Columns 60$' "$tempdir/out.pdf"
+grep --quiet '^        /K -1$' "$tempdir/out.pdf"
+grep --quiet '^        /Rows 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter \[ /CCITTFaxDecode \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/group4.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF CCITT Group4, little endian, msb-to-lsb, min-is-black"
+
+# We create a min-is-black group4 tiff with PIL because it creates these by
+# default (and without the option to do otherwise) whereas imagemagick only
+# became able to do it through commit 00730551f0a34328685c59d0dde87dd9e366103a
+# See https://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=34605
+python3 -c 'from PIL import Image;Image.open("'"$tempdir/gray1.png"'").save("'"$tempdir/group4.tiff"'",format="TIFF",compression="group4")'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Bits/Sample: 1'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Compression Scheme: CCITT Group 4'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Photometric Interpretation: min-is-black'
+# PIL doesn't set those
+#tiffinfo "$tempdir/group4.tiff" | grep --quiet 'FillOrder: msb-to-lsb'
+#tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Samples/Pixel: 1'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Type: Bilevel'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Endianess: LSB'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Depth: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'gray: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Compression: Group4'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:endian: lsb'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:photometric: min-is-black'
+
+img2pdf "$tempdir/group4.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/group4.tiff" pnggray
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/group4.tiff"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 1$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BlackIs1 true$' "$tempdir/out.pdf"
+grep --quiet '^        /Columns 60$' "$tempdir/out.pdf"
+grep --quiet '^        /K -1$' "$tempdir/out.pdf"
+grep --quiet '^        /Rows 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter \[ /CCITTFaxDecode \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/group4.tiff" "$tempdir/out.pdf"
+j=$((j+1))
+
+###############################################################################
+echo "Test $j/$tests TIFF CCITT Group4, without fillorder, samples/pixel, bits/sample"
+
+convert "$tempdir/gray1.png" -compress group4 -define tiff:endian=lsb -define tiff:fill-order=msb -define quantum:polarity=min-is-white "$tempdir/group4.tiff"
+# remove BitsPerSample (258)
+tiffset -u 258 "$tempdir/group4.tiff"
+# remove FillOrder (266)
+tiffset -u 266 "$tempdir/group4.tiff"
+# remove SamplesPerPixel (277)
+tiffset -u 277 "$tempdir/group4.tiff"
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Bits/Sample: 1' && exit 1
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Compression Scheme: CCITT Group 4'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Photometric Interpretation: min-is-white'
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'FillOrder: msb-to-lsb' && exit 1
+tiffinfo "$tempdir/group4.tiff" | grep --quiet 'Samples/Pixel: 1' && exit 1
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Type: Bilevel'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Endianess: LSB'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Depth: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'gray: 1-bit'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'Compression: Group4'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:endian: lsb'
+identify -verbose "$tempdir/group4.tiff" | grep --quiet 'tiff:photometric: min-is-white'
+
+img2pdf "$tempdir/group4.tiff" "$tempdir/out.pdf"
+
+compare_rendered "$tempdir/out.pdf" "$tempdir/group4.tiff" pnggray
+
+compare_pdfimages "$tempdir/out.pdf" "$tempdir/group4.tiff"
+
+grep --quiet '^45.0000 0 0 45.0000 0.0000 0.0000 cm$' "$tempdir/out.pdf"
+grep --quiet '^    /BitsPerComponent 1$' "$tempdir/out.pdf"
+grep --quiet '^    /ColorSpace /DeviceGray$' "$tempdir/out.pdf"
+grep --quiet '^        /BlackIs1 false$' "$tempdir/out.pdf"
+grep --quiet '^        /Columns 60$' "$tempdir/out.pdf"
+grep --quiet '^        /K -1$' "$tempdir/out.pdf"
+grep --quiet '^        /Rows 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Filter \[ /CCITTFaxDecode \]$' "$tempdir/out.pdf"
+grep --quiet '^    /Height 60$' "$tempdir/out.pdf"
+grep --quiet '^    /Width 60$' "$tempdir/out.pdf"
+
+rm "$tempdir/group4.tiff" "$tempdir/out.pdf"
+
+
+rm "$tempdir/alpha.png" "$tempdir/normal.png" "$tempdir/inverse.png" "$tempdir/palette1.png" "$tempdir/palette2.png" "$tempdir/palette4.png" "$tempdir/palette8.png" "$tempdir/gray8.png" "$tempdir/normal16.png" "$tempdir/gray16.png" "$tempdir/gray4.png" "$tempdir/gray2.png" "$tempdir/gray1.png"
+rmdir "$tempdir"