> With the photoshop channel mixer you can adjust the rgb values for the
> output channels. In other words, for each channel r, g, and b, you can
> adjust the rgb mix.

This sounds a little like the Curves tool in the gimp. Right-click on the 
image, it's in <image> / Image / Colors / Curves. I'm not sure if that's 
quite what you need... The Curves dialog box does let you modify each of the 
color channels separately, though, as well as the Value (black & white), and 
the Alpha.

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