https://bugs.kde.org/show_bug.cgi?id=494134
--- Comment #3 from Zamundaaa <xaver.h...@gmail.com> --- (In reply to lojcsgit from comment #2) > Thanks for the quick reply! > > > If you resize the window after changing the setting, does it go back to the > > brightness level it had before? > > No, it stays the same. That's weird. I just compiled the 6.2 branch and the video definitely snaps back to the brightness it had before changing the setting. > What's the default value for reference brightness? Is it supposed to be > calibrated against a piece of paper or something? That depends on your screen; for new output configs KWin defaults to 500 nits, or if your display can't show 500 nits in fullscreen, whatever the maximum value of the screen is. > I think it would be useful > if there was still an option to have passthrough or a nice suggested default > for the setting that approximates it. As for the name I think I saw 'paper > white' being used before, again not sure if that's what this is. It's quite literal, it refers to the brightness a sheet of paper would have in the room you're in. Pass through would *not* provide that, because the screen doesn't know about the room any more than KWin does, and most screens even lock the user out of brightness controls in HDR mode. The best approximation we have for paper white is the user setting the brightness level they're comfortable with - that's what the SDR brightness setting + the brightness slider are there for. That gives me an idea though: As the setting only exists to limit the brightness slider, so that you don't accidentally set it too high (above some reference luminance, displays start doing weird tone mapping for GUI elements), perhaps we can just show it as exactly that: An override for the max. brightness level of the brightness slider. I still need to add some brightness level override GUI for other values anyways... with that, this slider would just be gone from the main display settings page, and we could show the normal brightness slider instead (for HDR and SDR screens). > What's the brightness (of a video) that makes hdr equivalent to sdr? Could > it be possible to have a slider that adjusts this value for personal taste? > (eventually) In 6.3, an HDR video showing the reference luminance will already have the same brightness as an SDR video showing 100% white. In 6.2 the SDR brightness value to match the SDR content to (most) HDR videos is 203 nits. -- You are receiving this mail because: You are watching all bug changes.
