[FFmpeg-trac] #1279(swscale:closed): Transform X'Y'Z' to RGB via colormatrix

[FFmpeg]

#1279: Transform X'Y'Z' to RGB via colormatrix
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             Reporter:  wolfgangw    |                    Owner:
                 Type:  enhancement  |                   Status:  closed
             Priority:  wish         |                Component:  swscale
              Version:  git-master   |               Resolution:  fixed
             Keywords:  XYZ j2k      |               Blocked By:
  colormatrix                        |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by wolfgangw):

 Replying to [comment:21 cehoyos]:
 > Implemented by Nicolas Bertrand and Michael, tests definitely welcome!
 With the no-choice matrix used in xyz12Torgb48() / fill_xyztables() this
 really only allows to take input to sRGB (with a low-blacks crush along
 the way through approximated sRGB gamma instead of correct sRGB gamma).
 What if users need to take it to P3?

 Wrt sRGB gamma: It's entirely possible that people will have RGB source
 with correct gamma and others with approximated gamma (straight out of
 their image mastering). Apparently not all apps use correct sRGB gamma,
 both internally and in exports.

 Don't get me wrong: This is great for many scenarios. But I'm afraid it'll
 need a bunch of switches to live up to its potential.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1279#comment:37>
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