Abstract

The criterion of minimally distinct border is compared with the criteria of minimum flicker and equal brightness for assessing the luminance of a chromatic field. These psychophysical criteria are also compared with luminance measurements made with a photoelectric photometer. Minimally distinct border and minimum flicker yield similar results and both are comparable to luminance measurements if the observer has a spectral sensitivity similar to the CIE standard observer. The equal-brightness criterion is not comparable to the other methods for three of the four observers. The results indicate that the minimally distinct border criterion can be used as well as minimum flicker. When a visual photometer is used, the results suggest that minimally distinct border should be used as the criterion, not equal brightness.

© 1971 Optical Society of America

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