[FFmpeg-trac] #4858(avfilter:new): Support GIMP curves preset files in curves filter

[FFmpeg]

#4858: Support GIMP curves preset files in curves filter
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               Reporter:  llogan       |                  Owner:
                   Type:  enhancement  |                 Status:  new
               Priority:  wish         |              Component:  avfilter
                Version:  git-master   |               Keywords:  curves
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
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 The curves filter can accept Photoshop curves files, but not GIMP curves
 files.

 Attached is a GIMP curves file that increases contrast. Made with GIMP
 2.8.14.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4858>
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