[okular] [Bug 515941] PDF Print too dark

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=515941

--- Comment #9 from peer.griebel at web.de ---
I have conducted some tests and analyses.

I saved a very simple file containing a yellow rectangle from LibreOffice as a
PDF. I printed the file using both Okular and Firefox. 
The following files were created in /var/spool/cups:

cxxxxx print control file
dxxxxx print file

Okular prepares a PostScript file for printing, while Firefox creates a PDF
file. The latter file is much smaller than the original file. Both files
ultimately display the same, correct content. The color is correct.

Therefore, the color change must occur during the printing process in CUPS. The
print control files could be the culprit. Unfortunately, they are binary
encoded and I don't have a decoder. It's noticeable that the file generated by
Okular is much larger.

Looking at the files as hex dumps, it's clear that Okular has the setting
"print-color-mode: colorD" configured. No other settings related to "color" are
present.

"colord" was not originally installed on my computer. The
/var/log/cups/error.log file also contained messages like:
"CreateDevice failed: org.freedesktop.DBus.Error.ServiceUnknown:The name
org.freedesktop.ColorManager was not provided by any .service files."

However, installing colord did not resolve the issue of incorrect colors.

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