Abstract

A series of experiments is reported that extends an earlier study of the foveal threshold luminosity function and its dependence on chromatic adaptation. Heterochromatic brightness matches were made by a large-step, equality-of-brightness method at three luminance levels: 10 mL, 20 mL, and 40 mL. Results are compared for chromatically neutral white, and blue, green, yellow and red adapting-surround fields at three levels of adapting luminance: 10 mL, 20 mL, and 40 mL.

The results for suprathreshold photometric equations confirm the dependence of foveal luminosity on chromatic adaptation demonstrated earlier for threshold sensitivities. The foveal (1°) luminosity function is shown to undergo regular and consistent changes with changes in chromatic adaptation and to be further dependent on the ratio of surround/standard luminance. Implications of these results for the CIE system are touched upon.

© 1954 Optical Society of America

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