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support PNG palette images with icc profile (closes: #107)

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Johannes Schauer Marin Rodrigues 2021-10-03 20:59:59 +02:00
parent 80393b6efa
commit 09ad147d97
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 31 additions and 18 deletions
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49
src/img2pdf.py
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@ -1597,24 +1597,28 @@ def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
depth = rawdata[24]
if depth not in [1, 2, 4, 8, 16]:
raise ValueError("invalid bit depth: %d" % depth)
logger.debug("read_images() embeds a PNG")
cleanup()
return [
(
color,
ndpi,
imgformat,
pngidat,
None,
imgwidthpx,
imgheightpx,
palette,
False,
depth,
rotation,
iccp,
)
]
# we embed the PNG only if it is not at the same time palette based
# and has an icc profile because PDF doesn't support icc profiles
# on palette images
if palette == b"" or iccp is None:
logger.debug("read_images() embeds a PNG")
cleanup()
return [
(
color,
ndpi,
imgformat,
pngidat,
None,
imgwidthpx,
imgheightpx,
palette,
False,
depth,
rotation,
iccp,
)
]
# If our input is not JPEG or PNG, then we might have a format that
# supports multiple frames (like TIFF or GIF), so we need a loop to
@ -1805,6 +1809,15 @@ def read_images(rawdata, colorspace, first_frame_only=False, rot=None):
"Image contains an alpha channel which will be stored "
"as a separate soft mask (/SMask) image 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