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I'm not sure if this is the right forum for it, but I had a few questions about how color vision works. I know that mixtures of pure colors look like other pure colors. For example, some mixture of pure (monochromatic) green and blue looks like pure yellow. So for a given color, are there an infinite number of different mixtures of colors that look the same? How would you go about finding the frequency of a color that a given mixture of colors corresponds to? And how about converting a frequency to an RGB value?