SENSITIVITY DIFFERENCES IN CHROMA, HUE, AND LIGHTNESS FROM SEVERAL CLASSICAL THRESHOLD DATASETS

A check of the weighting functions proposed by the CIE Technical Commi ttee 1-29 (TC1-29) [Color Res. Appl. 18, 137-139 (1993)] has been carr ied out using pairs of samples with only a threshold difference in chr oma, hue, or lightness. Experimental results with object and aperture colors were used and some parametric factors can be appointed: the dep endence of Delta C on C* appears to be about two times stronger for r elated color versus the aperture color mode, and the Delta H dependen ce on C, weak but significant for related colors, becomes insignifica nt for aperture colors. The hue-angle dependences of Delta H after co rrection for C and the dependences of Delta L* on L* or C* are found not significant for aperture colors. After normalization of the five d ifferent datasets employed, the results achieved are in overall good a greement and support the proposal of the CIE TC1-29. (C) 1995 John Wil ey & Sons, Inc.