[okular] [Bug 464141] Okular is always printing in grayscale for HP Colorjet printers

[Dustin Siebert]

https://bugs.kde.org/show_bug.cgi?id=464141

Dustin Siebert <dsiebert at mail.uni-paderborn.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REPORTED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Dustin Siebert <dsiebert at mail.uni-paderborn.de> ---
The issue is actually related to this bug in CUPS:
https://github.com/OpenPrinting/cups/issues/421

The bug appears if the snap version of CUPS is installed (for me it was a
hidden installation because Chromium forced the Snap version during the
upgrade, what i didn't see).

Steps to fix:

1. Remove Snap version via: snap remove cups
2. Edit /etc/cups/printers.conf and change the line

Option print-color-mode monochrome

to

Option print-color-mode color

After a reboot the option is persistent instead of switching again to
monochrome, what was caused by the faulty Snap version of CUPS. Now, the
printer prints in color mode as expected for jobs by Okular.

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