EXAMINATION OF ADAPTATION COEFFICIENTS FOR INCOMPLETE CHROMATIC ADAPTATION

The chromatic-adaptation transform in the RLAB model by Fairchild et a l. was examined. In the transform, rite chromatic-adaptation coefficie nts by Hunt are used for taking account of the effect of incomplete ch romatic adaptation to a test chromatic illuminant. The adapting chroma ticities of the coefficients were estimated for illuminants A and D65 at several luminance levels. Further, a theoretical study clarified th e existence of a systematic deviation in the predicted results of corr esponding colors by the transform using the Hunt's coefficients. The r eason of the deviation was examined, and its correction method was pro posed. (C) 1997 John Wiley & Sons, Inc.