A SIMPLE ESTIMATION METHOD FOR EFFECTIVE ADAPTATION COEFFICIENT

A method was proposed in a previous article (CRA, 22, 240-258, 1997) t o estimate the state of incomplete adaptation by using the effective c hromatic adaptation coefficient alpha(min). The method could be applie d to any experiment on chromatic adaptation using object-color or lumi nous-color stimuli, but its computational procedure was rather tedious . For this reason, the two simple methods, Methods I and II, are propo sed to give the approximate estimates of alpha(min). Method I uses the corresponding reference color under reference illuminant to a test ac hromatic color under test illuminant. Method II uses the two kinds of relation equations between rest adapting luminance and alpha(min). The estimates of alpha(min) by each of the two methods agree fairly well with those given in the previous article to the three experiments stud ied. (C) 1997 John Wiley & Sons, Inc.