[FFmpeg-trac] #8120(documentation:new): blend filter, documentation

[FFmpeg]

#8120: blend filter, documentation
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             Reporter:  mkoch        |                     Type:  defect
               Status:  new          |                 Priority:  minor
            Component:               |                  Version:  git-
  documentation                      |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 The documentation of the blend filter doesn't explain any of the modes. A
 few modes are self-explaining, but most are not. Better explanations are
 required. Here are a few:

 addition: Output is (A+B), with an upper limit at white level

 average: Output is the arithmetic mean of A and B

 subtract: Output is (A-B), with a lower limit at black level

 difference: Output is the absolute difference of A and B

 grainextract: Output is (A-B), shifted to 50% gray level with a lower
 limit at black level and an upper limit at white level.

 darken: Output is the minimum of A and B

 lighten: Output is the maximum of A and B

 For all other modes I don't know how to describe them.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8120>
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