[kde] [Bug 476960] New: KDE Plasma feature request: screen RGB balance

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https://bugs.kde.org/show_bug.cgi?id=476960

            Bug ID: 476960
           Summary: KDE Plasma feature request: screen RGB balance
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: NixOS
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: tomasbessa at protonmail.com
  Target Milestone: ---

Created attachment 163131
  --> https://bugs.kde.org/attachment.cgi?id=163131&action=edit
Exaggerated simulation of RGB balance

SUMMARY
Desktop monitors come with built-in settings, including the screen's RGB
balance. Laptops don't have this setting and so laptop users rely on software
or the system to correct the screen color.

x11 Plasma has the gamma configuration in the screen settings, but, due to how
gamma algorithms work, gamma does not affect white, barely affects highlights,
and dark tones aren't affected the same amount as midtones.

Since Wayland and Plasma are working on color management, is it possible to
implement a screen RGB setting for Plasma Wayland? This setting would be in the
screen settings, where "gamma" is for x11 Plasma, and it would allow the user
to configure the intensity of the red, green and blue channels for the screen
output.

Unlike gamma, RGB balance influences darks, midtones and highlights all
equally, just like in desktop monitors.
This would allow the user to fix the tint and temperature of the laptop screen.

EXAMPLE
To exemplify, I simulated on Krita a scenario where I wanted to use RGB balance
to significantly lower the green channel, and how it would look like. The
example is in the attachment

System: NixOS (unstable branch)
KDE Plasma Version:  5.27.9
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10

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