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A symmetrical model of color vision, the decoding model as a new version ofzone model, was introduced. The model adopts new continuous-valued logic andworks in a way very similar to the way a 3-8 decoder in a numerical circuitworks. By the decoding model, Young and Helmholtz's tri-pigment theory andHering's opponent theory are unified more naturally; opponent process, colorevolution, and color blindness are illustrated more concisely. According to thedecoding model, we can obtain a transform from RGB system to HSV system, whichis formally identical to the popular transform for computer graphics providedby Smith (1978). Advantages, problems, and physiological tests of the decodingmodel are also discussed.

Illustrating Color Evolution and Color Blindness by the Decoding Model of Color Vision