[FFmpeg-trac] #769(swscale:open): png gray8 alpha decodes incorrectly

[FFmpeg]

#769: png gray8 alpha decodes incorrectly
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             Reporter:  ami_stuff     |                    Owner:
                 Type:  defect        |                   Status:  open
             Priority:  normal        |                Component:  swscale
              Version:  git-master    |               Resolution:
             Keywords:  gray8a alpha  |               Blocked By:
             Blocking:                |  Reproduced by developer:  1
Analyzed by developer:  0             |
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Comment (by ami_stuff):

 "gray_alpha.png" -> better sample for test.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/769#comment:8>
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