[FFmpeg-devel] [PATCH] avfilter/WIP: add selectivecolor filter

[Clément Bœsch]

On Sat, Aug 15, 2015 at 07:02:11PM +0200, Clément Bœsch wrote:
> ---
> Only K adjustment remains to fix before it's ready for a first upstream
> version. Help figuring out is still welcome. Otherwise, since this is very
> close to the final version, review is welcome as well.
> ---
>  doc/filters.texi                |  67 ++++++
>  libavfilter/Makefile            |   1 +
>  libavfilter/allfilters.c        |   1 +
>  libavfilter/vf_selectivecolor.c | 457 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 526 insertions(+)

Finally figured out the K adjustment and applied.

Remaining is making it bitexact to add a FATE test, and add >8bit support.

[...]

For the record, the original formula I was using was:

  f(v,a)   = clip(-a, -v, 1-v) . R

and taking k into account, it is now:
  f(v,a,k) = clip((-1-a).k - a, -v, 1-v) . R

With:
 f   adjustment function
 a   user component adjust (normed to [-1;1])
 v   component value (normed to [-1;1])
 k   user K adjust
 R   adjust range

-- 
Clément B.
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