The Physics Hypertextbook: Color
Objects don't have a color, they give off light that appears to be a color. Spectral power distributions exist in the physical world, but color exists only in the mind of the beholder. Our perception of color is not an objective measure of anything about the light that enters our eyes, but it correlates pretty well with objective reality.
A sprawling intro to the physics of color: wavelengths and frequencies, how our eyes work, the language we use, color spaces, additive and subtractive models, and more.
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