The hue uniformity of the CIELAB system is Of the three color attributes, the hue attribute is generated by the hue experiences, the lightness attribute by the investigated using a hue circle of Munsell colors at value 6 and chroma 14 and experimentally determined hue coef-lightness experience, and the chroma attribute by the relative magnitude of the hue and the lightness experiences. ficient data. CIELAB hue differences for equal Munsell hue increments are found to vary up to nearly a factor
The opponent-color model was first proposed by Hering 1 and has found its first mathematical expression 4, and hue coefficients differ from the experimentally determined ones by up to 40% at certain wavelengths. Dom-by Helmholtz. 2 Schro Β¨dinger showed that an opponent system can be mathematically derived as a linear transforma-inant wavelengths assigned by the CIELAB system to individual Munsell hues are found to vary up to 35 nm from tion of cone absorption functions. 3 Quantitative data in support of the opponent-color model were established by those of the Munsell Renotations. Four other color space systems are compared with widely differing but compara-Jameson and Hurvich in the form of their now classical hue cancellation experiments. 4 They derived opponent-ble results. The CIE 2Π color-matching functions are adapted to result in a set of opponent-color functions color functions for the CIE standard observer. Recordings from the cells in the retina and in the lateral geniculate accurately representing the Munsell Hue and Chroma data. A call is made for the experimental determination nucleus have provided much data that are seemingly in support of the opponent-color model. However, presently of the ''standard hue observer'' as a step toward an improved color space/color-difference formula. α§ 1998 there is no neurologically supported certain path from cone absorption functions to opponent-color functions