[Libav-user] Seeking for libavfilter functionality: overlay of grid over image, invert colors

[Bjoern Drabeck]

> As letter subject says, i seek for such pieces of functionality.
> Looking at filters list in docs i see there are no such filters. But i
> am also interested, is there any libraries rich for such and similar
> functionality, which are pluggable to libavfilter? Secondly, will
> libavfilter major developers agree with inclusion of such filters into
> upstream?
>
> --
> Andrey Utkin
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For inverting of colors, check the 'negate' filter, that might be
doing what you want...

-Bjoern