Why is the Red, Green and Blue color model so commonly used to produce a broad array of colors? According to Wikipedia: The choice of primary colors is related to the physiology of the human eye; good primaries are stimuli that maximize the difference between the responses of the cone cells of the human retina to light of different wavelengths, and that thereby make a large color triangle. The normal three kinds of photoreceptor cells in the human eye (cone cells) have peak responses of light wavelengths near 570 nm, 540 nm and 440 nm). Wait a minute? Isn't red light generally defined at 650nm instead of 570nm? So shouldn't we be using a Yellow, Blue and Green model?