HUE UNIFORMITY AND THE CIELAB SPACE AND COLOR-DIFFERENCE FORMULA

The hue uniformity of the CIELAB system is investigated using a hue ci rcle of Munsell colors at value 6 and chroma 14 and experimentally det ermined hue coefficient data. CIELAB hue differences for equal Munsell hue increments are found to vary yp to nearly a factor 4, and hue coe fficients differ from the experimentally determined ones by! crp to 40 % at certain wavelengths. Dominant wavelengths assigned by the CIELAB system to individual Munsell hues are found to vary YP to 35 nm from t hose of the Munsell Renotations. Four other color space systems nr-e c ompared with widely differing brit comparable results. The CIE 2 degre es color-matching functions are adapted to result in a set of opponent -color functions accurately representing the Munsell Hue and Chroma da ta. A call is made for the experimental determination of the ''standar d hue observer'' as a step toward'' nit improved color space/colar-dif ference formula. (C) 1998 John Wiley & Sons, Inc. Col Res Appl, 23, 31 4-322, 1998.