https://bugs.kde.org/show_bug.cgi?id=482780
Zamundaaa <xaver.h...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WAITINGFORINFO
CC| |xaver.h...@gmail.com
Status|REPORTED |NEEDSINFO
--- Comment #5 from Zamundaaa <xaver.h...@gmail.com> ---
(In reply to mith3113 from comment #0)
> SUMMARY
> With HDR enabled in display settings, colors appear very washed out, as if
> my monitor is handling all colors like they're bt.709 instead of bt.2020.
> Increasing the SDR Color Intensity slider to 100% makes SDR colors look
> correct, and viewing HDR content with MPV I can set --target-prim=bt.709 as
> a workaround. The only similar issue report I've seen is this resolved one:
> https://bugs.kde.org/show_bug.cgi?id=479168 However I'm having this issue on
> an Nvidia gpu over both DP and HDMI.
While it may not be that specific bug, if NVidia implements the Colorspace
property the same way Intel does, this could happen independently of the
connector type. I'll confirm with someone from NVidia next week.
(In reply to Dāvis from comment #1)
> Also for me that SDR Color Intensity slider doesn't work at all, it does
> nothing - no visual change between 0% and 100%.
That's bug 482809
(In reply to Dāvis from comment #3)
> Ohh it looks like SDR Brightness calculation is wrong. Atleast for me if I
> set it to max 542 nits then I get correct saturation but screen is WAY too
> bright (it daylight can be fine but at night I don't want to be blinded :D)
> With HDR disabled I can set monitor's builtin brightness to 0% and colors
> are still saturated while screen being dim/non-bright.
>
> So I think KWin does brightness wrong, it probably needs to increase
> saturation when decreasing brightness to keep same ratio so that colors
> don't look washed out or something like that.
You're not entirely wrong, the perceived intensity of a color is tied to its
brightness, and that's much more noticeable when the color is less saturated.
I'm not sure yet if we should do anything about that in KWin though.
(In reply to Dāvis from comment #4)
> No, it's not related to brightness, colors are just wrong, it's very
> noticeable when opening `htop` in Konsole and switching between HDR on and
> HDR off. The difference is so insane that HDR off looks WAY better and more
> "HDR" than with HDR on... Even with 542 nits those colors look washed out
> and not as "bright/colorful".
To some degree, that is expected. Without color management, wide color gamut
displays show very oversaturated colors, and if you get used to that, the
correct colors seem desaturated.
If that's actually what's happening for you though is hard do judge without
objective measurements. If you have access to a colorimeter, could you measure
what color gamut KWin actually outputs for sRGB apps? If you don't, a visual
comparison with a display close to sRGB (most laptops have that) would also be
useful.
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