Created attachment 146347 [details] KDE Plasma - Print Color Settings Print Color Mode setting in the print dialogue is not reflected in print-out & all prints are in normal color mode STEPS TO REPRODUCE 1. Open a PDF in Okular 2. Open Print Dialogue: CTRL+P 3. select a physical (non PDF) printer 4. go to "properties" right next to printer name 5. go to "Advanced" tab 6. Switch "Print Color Mode" to monochrome 7. Print OBSERVED RESULT Print-out is color EXPECTED RESULT Print-out is black & white SOFTWARE/OS VERSIONS Operating System: Kubuntu 21.10 KDE Plasma Version: 5.23.5 KDE Frameworks Version: 5.90.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION
Created attachment 146348 [details] KDE Plasma - Print Color Setting not available Sometimes, when selecting a different entry for the same physical printer model, the settings tab "Advanced" is not even available. Not understandable.
Created attachment 146350 [details] Firefox Print Dialogue Ironically, the following works: 1) open PDF file in Firefox 2) Open print dialogue (CTRL+P) 3) Change setting to color mode "black-white" 4) Print Outcome: Printout is in black-white.
I confirm this bug for: - Okular 21.12.3 - KDE Frameworks 5.92.0 - Qt 5.15.3 When "Mono" printing is selected via the "Properties" printer configuration dialog, output is in color anyways. In the past, Okular had a "Color Mode" selection in the "Options" tab of the print dialog (checked for Okular 0.20.2 in KDE 4.14.2). This no longer exists. It seems like okular somehow overrides the printer's settings with this kind of "Color Mode" selection, even though it doesn't exist in the print dialog anymore.
Created attachment 156547 [details] Print to PDF as grayscale I confirm this bug for: - Okular 22.08.3 - KDE Frameworks 5.102.0 - Qt 5.15.6 When "Mono" printing is selected via the "Properties" printer configuration dialog, output is in color anyways (Brother printer). The bug is present if you print to a PDF file too and you select grayscale in "Options", cf. OkularPrintPdfGrayscale.png attached file.
I have the opposite problem. Setting "Color Mode" to "Color", I always get a grayscale print. Seems to be a general problem with how Okular is transmitting color settings?
I can confirm this still happens for me with the latest KDE 6 on Arch. Is this a KDE or Qt bug after all? Anyone found a way to work around this?
Oddly enough, this happens if I use IPP Everywhere driver. In I use "deprecated" CUPS driver, then things work as expected. My printer is Brother DCP-L3550CDW, "deprecated" CUPS driver is https://aur.archlinux.org/packages/brother-dcpl3550cdw (repack of an official 32-bit one).