https://bugs.kde.org/show_bug.cgi?id=511007

--- Comment #5 from Zamundaaa <[email protected]> ---
> > matching what you actually see
> 
> Looks like picked color is not what I actually see, because it doesn't pick
> color with all graphics operations applied (I guess it doesn't respect
> gamma), so picked color is incorrect.
> 
> If the picked color would be correct (with all graphics operations), then
> the option somewhere in settings to select the behavior maybe will be
> nice-to-have.
It is correct - with low color temperatures and some ICC profiles, the
conversion to the output colorspace is lossy, because the framebuffer is fixed
point and just clips away negative color values, so sRGB->output->sRGB is just
not an identity transform.

Along with throwing away the effect night light and ICC profiles have on the
color, re-rendering in sRGB also changes the colors of blur and all translucent
surfaces. As we did indeed make the same tradeoff for screencasts and
screenshots, maybe doing the same for the color picker is the last bad option
too.
Do make that MR, I'll ping some people on it that might have insight on what
artists will want out of this.

> Additonal info: Color blindness options are also affected (including
> screenshots and screencasts even in 6.5.0).
Yes, they're per-window effects atm. That's something I hope to address sooner
than later (making it a fullscreen post-processing effect), but it requires
completing https://invent.kde.org/plasma/kwin/-/merge_requests/6743 first.

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