Abstract
Fifty-four subjects matched the brightness of CRT images using a luminance adjustment method. The log-luminance ratio (LLR) of brightness-matched images was the response index. Standard deviations of LLR depended on the color relationship of the compared sources, the background luminance, the target type, and the subject's age. Heterochromatic (i.e., different color) comparisons were more variable than either homochromatic (i.e., same color) or color-white comparisons. Standard deviations were greater for text than for circle comparisons and greater for high-luminance backgrounds than for low-luminance backgrounds. LLR was somewhat more variable for the older subjects in this study. By treating LLR as an index of brightness disparity, a one-dimensional scale of brightness was obtained for each subject. The degree of transitivity exhibited by these scales was relatively high and was not related to age or gender.
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