https://bugs.kde.org/show_bug.cgi?id=495026
Bug ID: 495026
Summary: ICC profiles applied incorrectly.
Classification: Plasma
Product: kwin
Version: 6.2.1
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: kwin-bugs-n...@kde.org
Reporter: m...@levymeister.com
Target Milestone: ---
Created attachment 175012
--> https://bugs.kde.org/attachment.cgi?id=175012&action=edit
two icc profiles, and a visual output from my colorimeter showing the problem
I have created an ICC profile to calibrate my monitor using displaycal, and a
spyder4 pro colorimeter. When I apply that profile, something is going wrong,
which is confirmed by the colorimeter not matching up. When I apply the same
profile directly in inkscape or gimp, it looks very accurate and the
colorimeter reports the colors as correct.
The process for calibration was:
1. Disable color management in kwin by setting Color Profile to None in system
settings
2. Run calibration
3. Take the generated icc profile, and tell kwin to use it
4. Notice that the colors look off
Steps to reproduce with the supplied file
1. Load the icc profile for a monitor in Display and Monitor -> Display
Configuration -> Color Profile -> ICC profile
2. Open inkscape and make a box with 40% grey
3. Note the color of the grey box. It's definitely not going to be a neutral
grey, since your monitor won't match mine, but it should look like something
4. Set the kwin icc profile back to None
5. Tell inkscape to use the icc profile as the display profile in Preferences
-> Input/Output -> Color management -> display profile
6. enable color management for the document in view -> color management
7. note how the color of the 40% grey box is different from when kwin was
applying the profile.
Interestingly, when I calibrate another one of my monitors, which has less
aggressive corrections, that mostly seems to work, though it's hard to tell
since the changes are much more subtle. I've attached that profile as well.
Monitor 2 #2 2024-10-18 20-40 D6500 2 F-S XYZLUT+MTX.icc is the aggressive
calibration that's applied incorrectly
Monitor 1 #1 2024-10-18 13-21 D6500 2.2 F-S XYZLUT+MTX.icc is the less
aggressive calibration that's maybe applied correctly, or maybe just too subtle
to notice
Linux/KDE Plasma: 6.2.1
KDE Plasma Version: 6.2.1
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2
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