Abstract

One hundred observers identified fifty test colors in the violet-green-white region of the chromaticity diagram. They were not allowed to use the name “Purple,” but only “Red,” “Yellow,” “Green,” “Blue,” and “White.” Small areas and low illuminances were used to simulate conditions under which signal lights must be recognized. The results are expressed as chromaticity zones within which the test colors were assigned given color names with various degrees of certainty. In comparison with earlier data obtained under identical conditions but with a “Purple” category, these results show improved identification of blue signals. Other changes and sources of variability are discussed. The data can be applied to the specification of boundaries for colored signals.

© 1959 Optical Society of America

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