QUANTIFYING COLOR APPEARANCE .4. TRANSMISSIVE MEDIA

The experimental data from this study extends the LUTCHI colour-appear ance data to cover transmissive media. Two further experiments were ca rried out: one used a large cut-sheet transparency viewed using a back -lit illuminator, and another used a 35-mm slide projected onto a whit e screen. These new data were used to reveal the changes in colour app earance caused by different viewing parameters studied, and to evaluat e the predictive accuracy of five uniform colour spaces and colour-app earance models. The results show that Hunt's 91 model (developed to fi t earlier experimental results) did not perform as well as it did in t he previous studies using nontransmissive media. This implies that the re are large differences in perceived colour appearance between transm issive and nontransmissive media viewing conditions. Some modification s were subsequently made to Hunt's 91 model and the predictive accurac y was greatly improved.