[FFmpeg-trac] #9167(undetermined:closed): Color changed when an image converting to video

[FFmpeg]

#9167: Color changed when an image converting to video
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             Reporter:  kvsico       |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 >because the color models do not overlap perfectly

 They do not overlap perfectly. Of course if you are doing limited vs. full
 range it is obvious. But even if you do full vs full, some YCbCr colors
 will be out-of-gamut for RGB. For example, YCbCr BT.709 values 139, 151,
 24 R'G'B' is -21, 182, 181 (which is what is used for xvYCC, but that is
 another topic).

 You can use calculator here: https://res18h39.netlify.app/color It the
 only one I found that is correct including BT.1886/XYZ and other stuff. Of
 course no way to reshape BT.1886 which is not perfect 2.4 gamma.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:6>
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