On Wed, Dec 10, 2014 at 02:26:51PM +0000, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> doc/filters.texi | 41 +++++++
> libavfilter/Makefile | 1 +
> libavfilter/allfilters.c | 1 +
> libavfilter/vf_colorlevels.c | 254
> +++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 297 insertions(+)
> create mode 100644 libavfilter/vf_colorlevels.c
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 0ea3955..444dfda 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -2934,6 +2934,47 @@ colorbalance=rs=.3
> @end example
> @end itemize
>
> +@section colorlevels
> +
> +Adjust video input frames using levels.
> +
> +The filter accepts the following options:
> +
> +@table @option
> +@item rimim
> +@item gimin
> +@item bimin
> +@item aimin
> +Adjust red, green, blue and alpha input black point.
> +Allowed ranges for options are @code{[-1.0, 1.0]}. Defaults are @code{0}.
> +
> +@item rimax
> +@item gimax
> +@item bimax
> +@item aimax
> +Adjust red, green, blue and alpha input white point.
> +Allowed ranges for options are @code{[-1.0, 1.0]}. Defaults are @code{1}.
> +
> +Input levels are used to lighten highlights (bright tones), darken shadows
> +(dark tones), change the balance of bright and dark tones.
> +
> +@item romim
> +@item gomin
> +@item bomin
> +@item aomin
> +Adjust red, green, blue and alpha output black point.
> +Allowed ranges for options are @code{[0, 1.0]}. Defaults are @code{0}.
> +
> +@item romax
> +@item gomax
> +@item bomax
> +@item aomax
> +Adjust red, green, blue and alpha output white point.
> +Allowed ranges for options are @code{[0, 1.0]}. Defaults are @code{1}.
> +
> +Output levels allows manual selection of a constrained output level range.
> +@end table
> +One of the most common usage for the color levels is to have an automatic adjustment of the range on the luma level. Typically, doing this: https://lut.im/OiNweWNU/MraUtDBe using a threshold on both side. Maybe you want to add such feature later thought. [...] -- Clément B.
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