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In the study of color harmony, Moon and Spencer have proposed the most famous model, and defined the harmony/ disharmony interval with hue difference, value difference, and chroma difference in a color combination. However, human does not perceive a coloralong its three attributes independently.. For this reason, we have adopted the colordifference formula (DE*ab) in the CIELAB color space as an integral color interval toinclude hue, value and chroma difference of a color combination in the previous study.We used this definition of color interval to study the "influence of color interval and area factor on color harmony among colors displayed on a CRT, and got some elementary results. To expand the scope of the previous study of color harmony, this study investigates color harmony of object colors. There are three issues to be explored in this study: 1.theinfluence of shape factor on color harmony; 2.the relationship between color interval and color harmony, and 3.the influence of area factor on color harmony. In the first part of this study, four different shapes are adopted in the experiment toreveal their influence on the perceived degree of color harmony. The results show that the differences of the degree of color harmony among these four shapes are statistically significant. In the second part of this study, we have tried to find out the degree of color harmony as the function of DE*ab. In the experiment, 400 2-color combinations with different values of DE*ab on color chips were presented to the subjects to evaluate the degree of color harmony of each combination. The results reveal a cubic-curve relationship between color interval and color harmony, as the same in the previous study, but the characteristic of this curve is somewhat different with our previous result of color on CRT display. Then, we have tested the hypothesis that a color combination will be harmonious when the area ratio between the two component colors is inverse to the "color intensity" ratio between them. In the experiment, we recorded subjects'' responses of the relative degree of color harmony to varied combinations with the same component colors but different arearatios. The results show that the factor of area ratio doesn''t obviously influence the relative degree of color harmony. Finally, we have examined the accordance between our data with some traditional principles of color harmony, and summarized some guidelines for color harmony.
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