This provides two image classes and a bunch of functions that work on them.

Why are they separate classes? I think the operations on the two of them are necessarily different. There's a whole bunch of operations that only really work on truecolor (blurs, gradients), and a few that only work on indexed images (palette swaps).

Even putpixel is pretty different. On indexed, it is a palette entry's index number. On truecolor, it is the actual color.

A greyscale image is the weird thing in the middle. It is truecolor, but fits in the same size as indexed. Still, I'd say it is a specialization of truecolor.

There is a subset that works on both


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