Because these tools are designed to work with planar data, which RGB is not. I could make them support any possible colorspace but this is a lot of work I don't want to do. My main goal for the version 1 of this package is to bring new possibilities in Avisynth processing, not to achieve production-class tools. That's why everything looks like clumsy hacks ; I just don't care about elegant design because I didn't plan any specification or anything, I just go where it looks interesting at the moment.
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