According to the trichromatic theory, color vision is the product of opposing pairs of color receptors, red-green, blue-yellow, and black-white, and when one member of a color pair is stimulated, the other member is inhibited.

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The trichromatic theory, proposed by Young and Helmholtz, suggests that color vision is based on the activity of three different types of color receptors (cones) sensitive to blue, green, and red light. The theory of opposing color pairs, where stimulation of one color in a pair inhibits the perception of the other, is known as the opponent-process theory, proposed by Hering.

According to the Trichromatic Theory, Color Vision Is the Product