According to the trichromatic theory of color vision, colors are mixed in three opposing pairs: blue or yellow, red or green, and black or white, by specialized cells in the retina and thalamus.

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The trichromatic theory of color vision, proposed by Young and Helmholtz, suggests that the human eye has three types of receptors sensitive to red, green, and blue light, not opposing pairs of colors. The concept of opposing colors is part of the opponent-process theory proposed by Hering, which describes how colors are processed at a neural level beyond the retina.

According to the Trichromatic Theory of Color Vision, Colors Are