[FFmpeg-trac] #9673(undetermined:closed): ffmpeg not reading color information from JPEG ICC profile

[FFmpeg]

#9673: ffmpeg not reading color information from JPEG ICC profile
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             Reporter:  Cosmin       |                    Owner:  haasn
  Stejerean                          |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  fixed
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by haasn):

 So, to recap a quick discussion we had about this at VDD:

 - This ICC profile is the built-in profile Apple use for all its DCI-P3
 content
 - The matrix coefficients appear to contain the "correct" values, which is
 ofc wrong as they're *supposed* to be adapted to D50 by spec (but aren't)
 - We can read out the "correct" coefficients using the unadapted observer
 (and raw white point tag), going against ICC spec but providing one
 possible way to work around

 If we care about detecting this particular profile we could work around it
 "easily" by using the above considerations to implement a compatibility
 code path. That said, I will have a look again at the ICCv4 spec and fully
 dissect this profile to make sure everything I wrote above is correct.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9673#comment:18>
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