SUMMARY Support for grayscale mode was added in https://invent.kde.org/plasma/kwin/-/merge_requests/8106 as a colorblindness filter. However, this maybe necessary not just for colorblind people, but also for people with regular vision to reduce eye strain. All modern mobile phones have a grayscale "bedtime mode". It would be nice to have a toggle switch for it. In Windows, the standard toggle switch for grayscale mode is `ctrl + meta + c`, and it would be nice if KDE retains the same toggle switch. This is also discussed in https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/3188#note_1308608 STEPS TO REPRODUCE 1. Try to turn on the grayscale mode OBSERVED RESULT There is no way to assign a keyboard shortcut to the grayscale mode EXPECTED RESULT There should be a way to assign keyboard shortcut to toggle grayscale mode. Windows uses `ctrl + meta + c`, and it would be nice to have the same convention in plasma.
It maybe a good idea to move grayscale mode to a regular kwin effect (rather than a colorblindness correction) so that the keyboard shortcut can be easily assigned.
I think it might be possible given that IIRC KWin's Magnifier/Zoom effect is listed in both Accessibility and KWin Effects configuration modules. It might also be a good idea to ask the KDE VDG for their input.