this post was submitted on 14 Jul 2024
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4
HDR Confusion (lemy.lol)
submitted 2 years ago* (last edited 2 years ago) by SitD@lemy.lol to c/linux_gaming@lemmy.world
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Hey fellas, could you help me understand a bit more about HDR?

  • I understand that it's an absolute brightness standard, not like the relative levels in SDR
  • But why does it end up washing out colors unless I amplify them in kwin? Is just the brightness absolute in nits, but not the color?
  • Why does my screen block the brightness control in HDR mode but not contrast? And why does the contrast increase the brightness of highlights, instead of just split midtones towards brighter and darker shades?
  • Why is truehdr400 supposed to be better in dark rooms than peak1000 mode?
  • Why is my average emission capped at 270nits, that seems ridiculously low even for normal SDR screens as comparison.

Cheers 😊

Edit: It's a QD OLED

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[–] Zamundaaa@discuss.tchncs.de 3 points 2 years ago

I understand that it's an absolute brightness standard, not like the relative levels in SDR

The standard is also relative brightness actually, though displays (luckily) don't implement it that way.

why does it end up washing out colors unless I amplify them in kwin? Is just the brightness absolute in nits, but not the color?

It depends. You might

  • have a driver bug. Right now only AMD has correct color space communication with the display, that doesn't work correctly on Intel and NVidia yet
  • have a display that does a terrible job at mapping the rec.2020 color space to the display
  • be just used to the oversaturated colors you get with the display in SDR mode

Why does my screen block the brightness control in HDR mode but not contrast?

Because displays are stupid, don't assume there's always a logical reason behind what display manufacturers do. Mine only blocks the brightness setting through DDC/CI, but not through the monitor OSD...

Why is my average emission capped at 270nits, that seems ridiculously low even for normal SDR screens as comparison

OLED simply gets very hot when you make it bright over the whole area, the display technology is inherently limited when it comes to high brightness on big displays