Opened 4 years ago
#2369 new enhancement
Add support for HDR to SDR tone mapping - BT.2020, BT.2100 (HDR) >> BT.709 (SDR)
| Reported by: | bug | Owned by: | beastd |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | unspecified | Severity: | major |
| Keywords: | Cc: | ||
| Blocked By: | Blocking: | ||
| Reproduced by developer: | no | Analyzed by developer: | no |
Description
Add support for Tone mapping
- Enable auto color space translation of HDR content for SDR displays
Various implementations and algorithms exist. VLC and Kodi use Reinhard, which enables decent color reproduction. Tone mapping can be implemented via Direct3d or Opengl (through libplacebo or use of gpu pixel shaders) with auto-detection of HDR monitor support.
MadVR (custom dshow filters) developed by madshi, is considered to produce the best results.
More HDR content is being produced and will eventually overtake SDR content.
Without tone mapping, users with SDR monitors and displays see washed out colors during playback of HDR content and will not be able to watch HDR videos with accurate (or even semi-accurate) color reproduction.
Tone mapping examples - (No tone mapping vs. VLC vs. PotPlayer + MadVR)
https://www.youtube.com/watch?v=duUGjcIznBc
https://www.youtube.com/watch?v=toZ1NbAJUjg
MadVR
http://madshi.net/
https://forum.doom9.org/showthread.php?t=146228
VLC (as of 3.0.0)
VLC implementations (Windows = d3d, linux = opengl with lilibplacebo)
https://code.videolan.org/videolan/vlc/-/commits/master?utf8=%E2%9C%93&search=tone+mapping
libplacebo
https://github.com/haasn/libplacebo
SPMC
Bug ticket 759
- HDR to SD conversion for 4k "NON" HDR screens to avoid the washed out look.
https://github.com/koying/SPMC/issues/759
Additional info
tone mapping algorithms
https://64.github.io/tonemapping/
Color space:
https://en.wikipedia.org/wiki/Rec._709
https://en.wikipedia.org/wiki/Rec._2020
https://en.wikipedia.org/wiki/Rec._2100
