On Mon, Sep 15, 2014 at 06:56:29PM -0800, Lou Logan wrote: > Radial gradient by Víctor Paesa. > Linear gradient by Paul Gentemann. > > Also-by: Víctor Paesa <victorpa...@googlemail.com> > Also-by: Paul Gentemann <beriu...@gmail.com> > Signed-off-by: Lou Logan <l...@lrcd.com> > --- > doc/filters.texi | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/doc/filters.texi b/doc/filters.texi > index bb486ea..5a7ad58 100644 > --- a/doc/filters.texi > +++ b/doc/filters.texi > @@ -5124,6 +5124,19 @@ Modify RGB components depending on pixel position: > @example > geq=r='X/W*r(X,Y)':g='(1-X/W)*g(X,Y)':b='(H-Y)/H*b(X,Y)' > @end example > + > +@item > +Create a radial gradient that is the same size as the input: > +@example > +geq=lum=255*gauss((X/W-0.5)*3)*gauss((Y/H-0.5)*3)/gauss(0)/gauss(0),format=gray > +@end example > +
You may mention @ref{vignette} filter here so people don't end up using it
verbatim.
> +@item
> +Create a linear gradient to use as a mask for another filter, then
> +compose with @ref{overlay}:
> +@example
> +geq=lum=255*(Y/H),format=gray[grad];[0:v]boxblur=4[blur];[blur][grad]alphamerge[alpha];[0:v][alpha]overlay
This filtergraph is complex and very input dependant; please provide a
complete command line as an example
> +@end example
> @end itemize
>
> @section gradfun
> --
> 2.1.0
>
--
Clément B.
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