Abstract
Theories of color-difference measurement provide a quantitative means for predicting whether two lights will be discriminable to an average observer. Consider the following color-measurement hypothesis. Suppose that two lights evoke responses from the color channels that we write as vectors, U and U′. The vector difference dU = U − U′ is itself a set of channel responses that will result from the presentation of some light. I test the hypothesis that U and U′ will be discriminable only if the light that gives rise to their differential, dU, is detectable. In the absence of a luminance component in the difference stimulus, dU, the vector-difference hypothesis holds well. In the presence of a luminance component, the theory is clearly false. When a luminance component is present, discrimination judgments depend largely on whether the lights U and U′ are in separate, categorical regions of color space.
© 1985 Optical Society of America
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