[FFmpeg-trac] #9460(avfilter:closed): ssim only 0.47 while PSNR is 37, and skimage's result is 0.914

[FFmpeg]

#9460: ssim only 0.47 while PSNR is 37,  and skimage's result is  0.914
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             Reporter:  xmufzy      |                    Owner:  (none)
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:  invalid
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by xmufzy):

 Replying to [comment:2 Elon Musk]:
 > The skimage converts to grayscale prior to calculations, if you do same
 with ssim, results is higher than skimage result.

 How can I get same result with ffmpeg?

 The difference between the two pictures looks very small, the value of
 ffmpeg's ssim can't match the result
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Ticket URL: <https://trac.ffmpeg.org/ticket/9460#comment:3>
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