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src/img2pdf.py: Disallow TIFF input with more than 8 bits per sample because PIL will silently convert it to 8 bits per sample

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Johannes 'josch' Schauer 2018-08-20 10:25:20 +02:00
parent a2b969640a
commit b758b54ce8
Signed by: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 11 additions and 0 deletions
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src/img2pdf.py
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@ -898,6 +898,17 @@ def read_images(rawdata, colorspace, first_frame_only=False):
if first_frame_only and img_page_count > 0: if first_frame_only and img_page_count > 0:
break break
# PIL is unable to preserve the data of 16-bit RGB TIFF files and will
# convert it to 8-bit without the possibility to retrieve the original
# data
# https://github.com/python-pillow/Pillow/issues/1888
#
# Some tiff images do not have BITSPERSAMPLE set. Use this to create
# such a tiff: tiffset -u 258 test.tif
if imgformat == ImageFormat.TIFF \
and max(imgdata.tag_v2.get(TiffImagePlugin.BITSPERSAMPLE, [1])) > 8:
raise ValueError("PIL is unable to preserve more than 8 bits per sample")
# We can directly copy the data out of a CCITT Group 4 encoded TIFF, if it # We can directly copy the data out of a CCITT Group 4 encoded TIFF, if it
# only contains a single strip # only contains a single strip
if imgformat == ImageFormat.TIFF \ if imgformat == ImageFormat.TIFF \