MEASURING COLOR-MATCHING FUNCTIONS .2. NEW DATA FOR ASSESSING OBSERVER METAMERISM

The Munsell Color Science Laboratory model and visual colorimeter for collecting color-matching-function data were described in Part I of th is-article. The model and instrument have demonstrated results that co rrelate well with data collected using the National Research Council o f Canada's Trichromator. Color-matching-function data for 18 observers and 20 repetitions on a single observer have been obtained using the Munsell Color Science Laboratory visual colorimeter. The variability f or the single observer for 20 repetitions over a month's time was foun d to be similar to the uncertainty of matching within a single measure ment session. The variability of the 18 observers was found to be much larger. The results were compared with the CIE Standard Deviate Obser ver. The variability of the CIE Standard Deviate Observer was on the o rder of the single observer variability while the multiple observer va riability was significantly larger.