Abstract

Heterochromatic brightness matches have been made between each of a variety of colors and a standard of approximately daylight quality. A binocular colorimeter was used with the field subtending an angle of 1° 50′. A modification of this colorimeter permits alternate presentation of adapting stimuli for nine seconds and test stimuli for one second. Four adapting colors, white (approximately daylight), red, green, and blue, were used. For each adapting color, a surround of approximately the same color and subtending an angle of 10° or more was used. The results show that, for adaptation to daylight, blues and saturated reds generally have less luminance than a neutral standard of the same brightness, while greens and yellows have luminances nearly equal to, or greater than, that of the standard. This is in general agreement with the results of previous investigations. For most test colors, adaptation to a saturated red results in greater luminance being required to match the daylight standard than was required with white adaptation. This is true even for colors complementary to the red-adapting stimulus. Adaptations to blue and green modify the luminance ratios to a lesser extent.

© 1958 Optical Society of America

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