The aim of this study was to find a rule in color harmony that could reveal the mutual influences of the three basic harmonies, those of hue, lightness, and saturation. One hundred and four color pairs were judged for harmony by five subjects five times. The results were analyzed by the conjoint measurement algorithm of . It was concluded that there is an interaction between saturation harmony and hue and lightness harmony together, and an additivity between hue harmony and lightness harmony. This implies the rule: color harmony = saturation harmony", (hue harmony + lightness harmony).In the history of psychology there have been a number of attempts to define a dependent variable in terms of, i.e., as a function of, several independent variables. These independent variables might interact with one another, or might be added together, or both, in order to determine the dependent variable. A salient example is the controversy between Hull and Spence (cited in The aim of this paper is to discover what combination rules are most appropriate for color harmony. The relevant literature is reviewed below, separately for the topics of color harmony and of combination rules.
Color HarmonyThe central notion behind a series of experiments on color harmony by Levelt (Berlyne, 1971, p. 179) was to produce evidence for the existence of rules in color harmony by combining the principal color qualities of hue, lightness, I and saturation. Three separate experiments were done, in each of which one quality was varied at a time while the other two were kept constant.In the first experiment, hue was varied in 96 pairs of color chips consisting of one primary hue (red, yellow, green, or blue) plus one of 24 colors which were about equally spaced along the color circle of the Hesselgren system (Hesselgren, 1953). TheThe author expresses his appreciation to Professor W. J. M. Levell, under whose supervision this study was conducted; he is also indebted to Dr. Ch. M. M. de Weert for reading earlier drafts of this paper. Queries and requests for reprints should be addressed to Jules M. Pieters, Department of Psychology, Erasmuslaan 16,6525 GG Nijmegen, The Netherlands. dependent variable was a judgment on a 7-point scale (l, clashing; 4, neutral; 7, harmonizing). The results were equivocal: The response curves for the four primary colors were quite different.The second experiment varied lightness, using the two color pairs judged highest and the two judged lowest, in harmony in the first experiment. Six lightness levels were used for each of the two colors of a pair. The results were similar to those obtained by Cohn (1894): Harmony judgments were an increasing function of the difference between the lightness of the two elements in the color combination. This function was linear on log-log coordinates, with a slope positively related to the harmony of the color pairs.In the third experiment, in which saturation was varied, there were color pairs with five levels of saturation for each of the two chips in a pair. The saturation data r...