[FFmpeg-trac] #9575(avfilter:closed): extractplanes=y produces garbage with gray10 input

[FFmpeg]

#9575: extractplanes=y produces garbage with gray10 input
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             Reporter:  Diederick    |                    Owner:  (none)
  Niehorster                         |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:  fixed
             Keywords:               |               Blocked By:
  extractplanes                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 Yep, fixed. Just for posterity "While it's pointless to extract the luma
 plane from a frame that only has a luma plane" is false. The whole point
 of extractplanes is to extract the bits as they are in the source format.
 That means that YCbCr (or Y only) conversion to R'G'B' does not happen.
 Yes, it so happens that (limited) Y only grayscale can be presented as
 (again, limited) R = G = B = Y, but that may be not the case in ICtCp or
 if color managment happens. And it is not the case in full range Y and
 full range R'G'B' (ffmpeg only supports full range R'G'B' anyway). Also,
 the Paul's code preserves superblack and superwhite for limited range and
 allows to analyse out-of-R'G'B'-gamut stuff for full range YCbCr.

 Ah, also png produces that way is not tagged in any way, and you can
 create many crazy stuff with this.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9575#comment:3>
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