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avoid converting palette PNG with alpha to RGB (closes: #158)

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Johannes Schauer Marin Rodrigues 2023-06-08 08:54:37 +02:00
parent e9e04b6dd9
commit 0cbcb8fa12
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
2 changed files with 18 additions and 12 deletions
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25
src/img2pdf.py
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@ -2101,7 +2101,16 @@ def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
)
)
else:
if (
if color in [Colorspace.P, Colorspace.PA] and iccp is not None:
# PDF does not support palette images with icc profile
if color == Colorspace.P:
newcolor = Colorspace.RGB
newimg = newimg.convert(mode="RGB")
elif color == Colorspace.PA:
newcolor = Colorspace.RGBA
newimg = newimg.convert(mode="RGBA")
smaskidat = None
elif (
color == Colorspace.RGBA
or color == Colorspace.LA
or color == Colorspace.PA
@ -2115,6 +2124,11 @@ def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
newcolor = color
l, a = newimg.split()
newimg = l
elif color == Colorspace.PA or (
color == Colorspace.P and "transparency" in newimg.info
):
newcolor = color
a = newimg.convert(mode="RGBA").split()[-1]
else:
newcolor = Colorspace.RGBA
r, g, b, a = newimg.convert(mode="RGBA").split()
@ -2125,15 +2139,6 @@ def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
"Image contains an alpha channel. Computing a separate "
"soft mask (/SMask) image to store transparency in PDF."
)
elif color in [Colorspace.P, Colorspace.PA] and iccp is not None:
# PDF does not support palette images with icc profile
if color == Colorspace.P:
newcolor = Colorspace.RGB
newimg = newimg.convert(mode="RGB")
elif color == Colorspace.PA:
newcolor = Colorspace.RGBA
newimg = newimg.convert(mode="RGBA")
smaskidat = None
else:
newcolor = color
smaskidat = None

5
src/img2pdf_test.py
View file

@ -4276,9 +4276,10 @@ def gif_transparent_pdf(tmp_path_factory, gif_transparent_img, request):
== b"q\n45.0000 0 0 45.0000 0.0000 0.0000 cm\n/Im0 Do\nQ"
)
assert p.pages[0].Resources.XObject.Im0.BitsPerComponent == 8
assert p.pages[0].Resources.XObject.Im0.ColorSpace == "/DeviceRGB"
assert p.pages[0].Resources.XObject.Im0.ColorSpace[0] == "/Indexed"
assert p.pages[0].Resources.XObject.Im0.ColorSpace[1] == "/DeviceRGB"
assert p.pages[0].Resources.XObject.Im0.DecodeParms.BitsPerComponent == 8
assert p.pages[0].Resources.XObject.Im0.DecodeParms.Colors == 3
assert p.pages[0].Resources.XObject.Im0.DecodeParms.Colors == 1
assert p.pages[0].Resources.XObject.Im0.DecodeParms.Predictor == 15
assert p.pages[0].Resources.XObject.Im0.Filter == "/FlateDecode"
assert p.pages[0].Resources.XObject.Im0.Height == 60