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kcm: add an HDR calibration tool

Xaver Hugl requested to merge work/zamundaaa/hdr-calibration into master

This tool shows a fullscreen window, for calibrating

  1. the peak luminance of the display, which displays often report wrong.

This shows a white square covering 10% of the display area at 10000 cd/m² (which the monitor limits to the maximum it can actually show), and the Plasma logo at a luminance level configured by the user. When the brightness level is configured so that you just barely can't see the Plasma logo anymore, then we've roughly reached the maximum brighness level.

Screenshot_20250501_124535

  1. the max sdr luminance

This one changes what "100%" of the normal brightness slider means, and needs to be configured

  • low enough so that the monitor's tone mapping doesn't interfere with image quality
  • low or high enough to match user preference

Screenshot_20250501_123954

I think I can do better for the SDR test pattern, and maybe get a better HDR image too, but this is good enough for now.

For the max. average luminance, that stays a command-line only option for now; if it turns out that adding a page for it would be beneficial, we can still do that later.

cc @teams/vdg

Edited by Xaver Hugl

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