Abstract

Reference and test stimuli were produced on two separate color television screens to evaluate the color discrimination ability of the human eye for near-white colors. Each test stimulus had a luminance approximately equal to that of the reference, but was slightly different in chromaticity, e.g., |Δx| < 0.01, |Δy| < 0.01. The evaluation involved 20 persons observing 26 sets of color stimuli of 16-cd/m² luminance, and 21 persons observing sets of color stimuli of 253 cd/m². Observers were requested to categorize the color differences they perceived on a six-level rating scale. The results indicate that the differential thresholds for color difference of near-whites are between 4 and 8 CD (Color Difference), except in the bluish region.

© 1979 Optical Society of America

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