#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):

 Replying to [comment:4 cehoyos]:
 > ffmpeg -i basi4a08.png -pix_fmt yuv420p out.tif

 I can reproduce the problem with it (please see the attached output tif
 file), so maybe a bug in gray8a -> yuv420p conversion?

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/769#comment:5>
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