Uniform color space modeled with cone responses

An opponent-color model based an simple subtractions of color-matching func tions and found useful for modeling the uniform color space is expressed in terms of cone activity functions approximating those of Smith and Pokorny. Taking into account neuro-physiological information, it is found that two stages are necessary to model the yellowness-blueness function and three st eps for the redness-greenness function. The third step is similar to one pr oposed by Muller and Judd. It provides significantly increased hue discrimi nation in the spectral region of 470-500 nm. The model is shown to be super ior for representing uniform color space compared to those proposed by Guth et al. and DeValois and DeValois. (C) 2000 John Wiley & Sons, Inc.