On Thu, Dec 11, 2014 at 11:41:42AM +0100, Clément Bœsch wrote:
> 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.
btw, libpostproc supports auto levels, -vf pp=al
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Old school: Use the lowest level language in which you can solve the problem
conveniently.
New school: Use the highest level language in which the latest supercomputer
can solve the problem without the user falling asleep waiting.
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