[FFmpeg-trac] #9947(undetermined:new): Misbehaving Curves Filter

[FFmpeg]

#9947: Misbehaving Curves Filter
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             Reporter:  kesh         |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  curves       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by kesh):

 IMHO, it appears that
 [https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.PchipInterpolator.html#scipy.interpolate.PchipInterpolator
 PCHIP 1-D monotonic cubic interpolation] produces a curve much like GIMP.
 Here is the PCHIP curve of the presented case over the FFmpeg curve:

 [[Image(pchip_ffmpeg_curves.png)]]

 Based on what I've seen online, this interpolation algorithm may very well
 be what Photoshop uses.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9947#comment:3>
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