https://bugs.kde.org/show_bug.cgi?id=525497
Bug ID: 525497
Summary: okular fails to render pdf which is handled correctly
by other viewers
Classification: Applications
Product: okular
Version First 25.12.1
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: PDF backend
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 195963
--> https://bugs.kde.org/attachment.cgi?id=195963&action=edit
pdf containing jp2 with alpha channel and SMaskInData = 1
DESCRIPTION
The alpha2.pdf contains a jp2 image which is 8 bit RGB with an alpha channel
for
transparency. Normally, with transparency you have one object containing the
RGB channels and a separate object for the SMask which is a single channel
with transparency data, but for JP2 you can set the attribute "SMaskInData"
and the renderer uses the transparency info in the image without a separate
SMask object.
It is not just okular which has problems with this pdf. On linux I
found:-
Not working
=======
okular
evince
atril
qpdfview
xpdf
Are working
=======
gwenview
mupdf
display
gv
firefox
chrome
STEPS TO REPRODUCE
1. open alpha2.pdf with okular
2.
3.
OBSERVED RESULT
The jp2 image within the pdf is corrupt.
NOTE: If a transparent jp2 is embedded as one Image object with the 3 RGB
channels which points to a separate SMask object with the alpha channel, the
pdf is shown normally. The problem occurs when all 4 channels are in the Image
object and the SMaskInData attribute is set to 1.
EXPECTED RESULT
Correctly rendered pdf.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.0
ADDITIONAL INFORMATION
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