Many kinds of research have been undertaken on color constancy under various illuminations; however, not many people have studied this domain in the context of vivid colored light. In this article, 23 color chips were assessed using the elementary color‐naming method under 13 RGB‐LED illuminations of six hues as red, yellow, green, cyan, blue, and magenta. A total of 100 subjects participated in the study and reported that color chips of cyan, yellow, and green light were not good as compared to the others. This article also proposes an elementary color‐naming method as an alternative way to study and calculate color constancy index using the two rooms technique as extending experiment booth to get the color appearance of the color chip without adapting to the colored illumination. Our results suggested individual color appearance performance for each colored light which yellow, cyan, and green are not recommended as shown by poor area ratio and color constancy index.
Our previous experiment showed that the color appearance of color chips changes depending on the color of illumination. In this article, we continued to analyze the previous data of 23 color chips under six vivid colored illuminations (red, yellow, green, cyan, blue, and magenta) that were assessed by 100 subjects. We found that there were usually two directions of shifted color under vivid illumination. For example, color chips would change to either a dark blue or orange direction under vivid red illumination depending on the color of the color chips. We also found that there is a similar mechanism behind the chromatic adaptation in relation to the complementary color.
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