Papers in the field of color vision mechanism is reviewed. A recently proposed color vision model which is based on the stage theory and includes nonlinear paths between luminance and two chromatic channels is explained in connection with the luminous efficiency, cone response functions, opponent color process and nonlinear nature in color perception. Finally, Land's retinex theory is briefly described. Accoding to this theory, we can interprete the constancy in color perception and the principle of the Land's two-color method for obtaining full color on a screen by superimposing two images of black and white slides which are taken through either red or green filter and are projected through a red or no filter, respectively.
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