Abstract

Chromatic discrimination ellipses derived from the variability of color-matching data suggest that thresholds may in part depend on test size S, chromatic and/or luminance adaptation A, chromatic and/or luminance composition of the test T, and possibly complex interactions of these factors. We approach the problem directly by using a simple detection task and by representing thresholds as differences between field and test XYZ coordinates, i.e., as vectors in tristimulus space. Using a method of adjustment procedure, we measured detection thresholds for small test spots surrounded by a large adapting field.

© 1988 Optical Society of America