VARIOUS CHROMATIC-ADAPTATION TRANSFORMATIONS TESTED USING NEW COLOR APPEARANCE DATA IN TEXTILES

A new set of colour appearance data was obtained from a series of expe riments in which 240 wool samples having a large size of 3 x 3 in. squ are that subtends 10 degrees at the observer's eye, and covering a lar ge colour gamut were used. Each colour was assessed by a panel of five observers using a magnitude estimation method under three light sourc es, D65, TL84, and A. In total, 10,770 estimations were made, and thes e form a set of new colour appearance data in textiles. Data analysis was carried out and shows that the accuracy of the visual results for different observers is quite good. The colour appearance data were use d to test the performance of seven chromatic-adaptation transformation s, i.e., BFD, Bartleson, von Kries, CIE, Hunt, CIEL a*b*, and Fairchi ld. The results show that the BFD transformation gives the most accura te prediction to the visual results between all transformations studie d. All transformations can have a better fit to the experimental grid under TL84 than that under A. However, the results given by the best c hromatic-adaptation transformation are still unsatisfied in colour ind ustries, especially in the textile industry. The two sets of experimen tal grids respectively derived from this work and by Luo et al. (1991) were also studied. An expected difference between the two sets of exp erimental grids was found. The difference may mainly result from two f actors: the experimental method in assessment and the size of the samp les. (C) 1995 John Wiley & Sons, Inc.