https://bugs.kde.org/show_bug.cgi?id=499934
--- Comment #14 from Zamundaaa <xaver.h...@gmail.com> --- (In reply to TheFeelTrain from comment #10) > Most games call this "HDR Paper White" so that would be recognizable for > most people. However this illustrates the problem with this setting, as > games let you set this value in the their own settings. So unless the system > setting is 203, the in-game setting is now going be inaccurate. > > For example I want my desktop to be at 100 nits because that's what I run my > monitor at in SDR, but if I were to set Plasma's slider to 100 and the > game's paper white setting to 200 as I usually would, everything is half the > brightness it should be. It gets even more messy if I set the Plasma slider > to something like 300, which is fairly normal for people to use. If the > in-game setting is also set to 300, now in-game is 1.5x the brightness it > should be. No reasonable person would expect it to work this way. A value of > 300 should result in an output of 300. That's not how that works. Neither on Android, nor iOS, nor MacOS, nor on any TV, nor on Windows laptops. Only Windows pretend that it's the case on desktop monitors, but that's not intentional but instead a serious design flaw that's kept for backwards compatibility. Even there it's not really true because monitors do their own things with the image. But I fully agree that the vast majority of Windows games do HDR quite badly and in a way that confuses a lot of people. The fact that you have to configure brightness settings per game in 2025 is ridiculous! > How is it nonsense? While I lack the means to measure it, I imagine my room > is pretty close to a reference environment. I have black out curtains and > the lamp I use is extremely dim. I run my monitor at exactly 100 nits for > SDR and it is perfect. There is not "a" reference environment, there are many, for different standards. With BT.2408, 203 nits is the comfortable average brightness, iow the correct one for SDR content. If that's too bright for your room, then you do not have the BT.2408 viewing environment but something darker. > > What would that "HDR" slider apply to? Something that goes 10% above SDR > > brightness levels? 20%? 50%? Something only with specific transfer > > functions? If so, which ones? > > It is strange to me that you need to ask this. One slider for SDR surfaces > and one slider for HDR surfaces is not some crazy suggestion. It's obvious > it's possible to have separate settings because it already worked that way > in 6.0, 6.1, and 6.2. It did not work like that. BT2020PQ and scRGB had some special cased logic for the frog protocol / gamescope specifically, which did not work with any other HDR content and made brightness control and tone mapping more difficult and limiting. (In reply to klaymorer from comment #12) > This seems like a good point. The issue right now is, I don't want white > websites and documents to blast my eyes out at 203 nits, but still want > games and videos to be bright and look nice. In 6.2 this was achieved by > having HDR content not be affected by SDR brightness (since media is often > HDR and other apps are SDR), but if Firefox or LibreOffice suddenly started > rendering in HDR then they would have been too bright. It seems like more of > a media vs productivity issue than HDR vs SDR. Adding a window action or something to change the brightness of an individual window could be reasonable, so you could increase or decrease the brightness of a game or movie without affecting the rest. In theory, we have protocols to allow apps to specify whether or not their window contains a game or video, but in practice for this use case it wouldn't be too useful as it's neither that widely used yet. It also can't really deal with for example web browsers showing a video or game inside of a website. (In reply to bugreports61 from comment #13) > letme also jump i here, just to be sure that things work as they should. > As the other people, i would like to have my desktop sdr at ~100 Nits. Please, get that brightness target out of your head. Unless you set up a specific *measured* viewing environment, you really should not care about any numbers here. Reference viewing environments are guidelines for what whitepoint, display and environment brightness levels, amount of glare etc. are good for content production, not something that you as the consumer are supposed to recreate! Just set up the brightness to be what you're comfortable with. All content, HDR or not, will be adjusted to match, and there's nothing more to it than that. -- You are receiving this mail because: You are watching all bug changes.
