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Set SMaskInData to 1 for PDFs with alpha

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This commit is contained in:
Andrew Murray 2023-08-03 19:11:35 +10:00
parent 6d3630d406
commit 022e650d18
1 changed files with 3 additions and 0 deletions
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3
src/PIL/PdfImagePlugin.py
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@ -128,6 +128,7 @@ def _save(im, fp, filename, save_all=False):
bits = 8
params = None
decode = None
smaskindata = 0
#
# Get image characteristics
@ -177,6 +178,7 @@ def _save(im, fp, filename, save_all=False):
filter = "JPXDecode"
colorspace = PdfParser.PdfName("DeviceRGB")
procset = "ImageC" # color images
smaskindata = 1
elif im.mode == "CMYK":
filter = "DCTDecode"
colorspace = PdfParser.PdfName("DeviceCMYK")
@ -232,6 +234,7 @@ def _save(im, fp, filename, save_all=False):
Decode=decode,
DecodeParms=params,
ColorSpace=colorspace,
SMaskInData=smaskindata,
)
#