How equivalent conspicuity in two-color combinations is expressed in color space

Abstract

If we can present color combinations of the same conspicuity to users, it may help them choose arbitrary color combinations suited for particular purposes (e.g. spatial design, color accessibility etc.). This study aims to find quantitatively how equivalent conspicuities are expressed in a color space. In the experiment, we used two center-surround type color combination stimuli: the reference and the test stimulus. A subject adjusted the saturation of the center of the test stimulus along a given direction in the a*b* plane until the test stimulus had the same conspicuity as that of the reference stimulus. The results indicate that the equivalent conspicuous points are well-expressed as an ellipse. Further, our results indicate that the degree of conspicuity was different depending on hue even if the color difference was the same. These results show the similar trends as a previous study [1].