this post was submitted on 01 Apr 2025
27 points (96.6% liked)
Linux
52789 readers
452 users here now
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Rules
- Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
- No misinformation
- No NSFW content
- No hate speech, bigotry, etc
Related Communities
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Again, the reference luminance mapping is all about how applications should use the Wayland protocol.
How to map SDR to HDR can indeed be made much more complicated, from simple gamma adjustments to some full blown ITM meant for images or videos, like what BT.2446 suggests, but as far as applications are concerned, those are edge cases that they don't really need to be prepared for.
It's not like they have a different choice - unless the compositor supports custom reference luminance levels (which KWin does, but not all others do), then they need some logic to calculate peak luminance levels. If the compositor steps outside of those common expectations for reference luminance mapping, then the result may not be ideal, but there is no way for the application to do better.