[FFmpeg-trac] #8764(avfilter:new): Colorbalance filter overexpose

[FFmpeg]

#8764: Colorbalance filter overexpose
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  paulpacifico                       |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
             Keywords:               |  master
  colorbalance                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 Since 4.3 release, colorbalance filter always overexpose picture.

 How to reproduce:
 {{{
 % ffmpeg -i "image.png" -vf "colorbalance=rm=0.3" -f image2pipe - | ffplay
 -

 With pl=1 image is black and white.
 }}}

 Tested on FFmpeg 4.3 and git-2020-06-28-4cfcfb3 on Windows and Mac

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Ticket URL: <https://trac.ffmpeg.org/ticket/8764>
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