[FFmpeg-trac] #2684(swscale:new): Black becomes dark gray when converting rgb24 to gray

[FFmpeg]

#2684: Black becomes dark gray when converting rgb24 to gray
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             Reporter:  b_jonas     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  important   |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by michael):

 Patch on ml

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2684#comment:5>
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