Abstract

<p>Five observers made color-difference judgments by the method of triads. A triad (<i>S: A,B</i>) consisted of a standard stimulus <i>S</i> and two comparison stimuli, <i>A</i> and <i>B.</i> The observer reported which color difference appeared smaller, that between <i>A</i> and <i>S</i> or that between <i>B</i> and <i>S</i>. Triads were composed of monochromatic stimuli, adjusted to constant brightness for each observer. They contained both small color differences and ones that are markedly supraliminal. For any triad (<i>S: A,B</i>) it was assumed that the choice probability is an index of the relative sizes of the subjective differences (<i>A,S</i>) and (<i>B,S</i>). Estimated choice probabilities were converted to estimated distance measures by means of a scaling model based on assumptions about the observers’ judgmental task.</p><p>The obtained distance estimates were compared with standard wavelength-discrimination data, with Wright’s data on slightly supraliminal color differences, and with the large-difference predictions of the Hurvich-Jameson HBS color specification system. While the present data cannot be regarded as providing definitive color-difference measures (even for the limited range of conditions employed) they nevertheless contribute to the development of a metric space representation combining discriminability and supraliminal similarity.</p>

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