[MPlayer-users] Feature request: derainbow filter

Corey Hickey bugfood-ml at fatooh.org
Sun Mar 23 11:38:45 CET 2003

James Bostick Crowson wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Lots of times, anime DVDs will have odd "rainbows" or odd changing colors
> on edges.  I've been using a chroma gaussian blur (-vop scale -ssf cgb=1)
> to get rid of them, but this only deals satisfactory with mild rainbowing.
> For the more severe ones a blur radius of 3-4 works well, but degrades
> image quality unacceptable on everything else.  It would be nice if
> mplayer/mencoder had some sort of adaptive chroma gaussian blur, which
> could take two radii and a threshold, and use the first (smaller) blur
> radius for each pixel where the chroma change from the last frame is below
> the threshold, and the larger radius for each pixel where the chroma
> change is above the threshold, or something similar.

I don't have any idea what you're describing. :) ...and probably others
on this list don't either. Perhaps post a screenshot (use mplayer -vo
jpeg) or upload a video sample to mplayerhq.hu.


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