Well, I've had my fun with RGB, but I thought it would be worth trying other color-spaces to see how the interpolation behaves. I have a sample of RGB vs. YCbCr here. The top bar of each pair is in RGB and the bar below is in YCbCr. The feature that seems to be be most apparent is that the transitions seem slightly smoother, and the colors are more tempered overall. I think the luminance is also constant, but it's hard to tell.
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