Filter curves
  Adjust components curves.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
curves AVOptions:
  preset            <int>        ..FV.... select a color curves preset (from 0 to 10) (default none)
     none                         ..FV....
     color_negative               ..FV....
     cross_process                ..FV....
     darker                       ..FV....
     increase_contrast              ..FV....
     lighter                      ..FV....
     linear_contrast              ..FV....
     medium_contrast              ..FV....
     negative                     ..FV....
     strong_contrast              ..FV....
     vintage                      ..FV....
  master            <string>     ..FV.... set master points coordinates
  m                 <string>     ..FV.... set master points coordinates
  red               <string>     ..FV.... set red points coordinates
  r                 <string>     ..FV.... set red points coordinates
  green             <string>     ..FV.... set green points coordinates
  g                 <string>     ..FV.... set green points coordinates
  blue              <string>     ..FV.... set blue points coordinates
  b                 <string>     ..FV.... set blue points coordinates
  all               <string>     ..FV.... set points coordinates for all components
  psfile            <string>     ..FV.... set Photoshop curves file name
  plot              <string>     ..FV.... save Gnuplot script of the curves in specified file

This filter has support for timeline through the 'enable' option.

