RGB-Channel-Mixer (Technicolor-Effect)

Hi,

do we have some thing like "yuvchannelmixer"? That is: A filter in which 
I can perform this:

R = 1.75 * R - 0.50 * G - 0.25 * B
G = -0.25 * R + 1.50 * G - 0.25 * B
R = -0.25 * R - 0.50 * G + 1.75 * B

It would be neat to have as you can easily do some weird chroma effects 
with that type of program (eg. you can simulate the channel-specific 
oversaturation of a 2 or 3 stripe technicolor-film...).

BTW: you can do some strange 70ths effects, too, with such a filter... 
(If we do not have something like that, maybe we can change yuvcorrect 
to allow for such filtering?)

cu
Stefan

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