Re: RGB-Channel-Mixer (Technicolor-Effect)

Hi,

stefan wrote:
> 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

I would call this "color matrix"-filter rather than channel mixer.

It would indeed be a very universal tool, if it allows arbitrary
coefficient matrices, and also an offset (so you can do things
like channel = 1.0 - channel).

If I'm not mistaken, it's always possible to convert
such a matrix from RGB to YUV, so the user can specify the RGB matrix,
while the filter uses the (faster) YUV matrix.

Just my $0.02

Burkhard

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