PREDICTING CORRESPONDING COLORS USING A NEW CHROMATIC-ADAPTATION MODEL

A new chromatic-adaptation model is proposed to determine correspondin g fundamental tristimulus values that elicit the same colour appearanc e over changes in illumination conditions, integrating several hypothe ses put forward by earlier researchers such as the linear: von Kries a nd Helson et al.; the nonhomogeneous and linear: Burnham et al.; the n onlinear: MacAdam, Hunt, Bartleson, BFD, RLAB, LLAB and so on, the new model emerges as a nonhomogeneous, linear model incorporating von Kri es coefficients with nonlinearities. No covert information is required beyond a knowledge of the tristimulus values of samples and illuminan ts. To compare the performance of this model with those of other curre ntly available transformation methods, the corresponding-col ours data from four independent studies of chromatic adaptation are used. The r esults indicate that the new model agrees well with the four sets of d ata used. The new model gives more accurate prediction to these data t han the others tested. Hence, it is obvious that the proposed model ca n give accuracy as well as generality and simplicity. The new nonhomog eneous, linear model is more suitable for chromatic adaptation than th e others tested at least for the four independent sets of experimental data employed. (C) 1997 John Wiley & Sons, Inc.