Proposal of “Brilliantness”: an integrated dimension of subjective brightness and vividness in PCCS tones by psychological methods

Abstract

  The purpose of this study comprises three points: 1) creating a concept combining “brightness” and “vividness”, which was named “Brilliantness” :Brt; 2) expressing Brt by the numerical value; and 3) investigating the relationship of Brt between color image dimensions. 65 colors (12 tones by 5 hues [red, yellow, green, blue, and purple], and 5 achromatic colors) in Practical Color Co-ordinate System were used as stimuli. These colors were evaluated in terms of “Brightness,” “vividness”, and color images (15 adjective pair words). As a result, “brightness” and “vividness” were correlated. “Brightness” and “vividness” were analyzed by principal component analysis (PCA). PCA demonstrated a concept that combined “brightness” and “vividness.” The contribution ratio of the component was 88.2%. The concept was named “Brilliantness.” The color images were subjected to factor analysis, and three factors were revealed. The correlation coefficients between “Brilliantness” and factor scores were calculated. High correlation coefficients were found between “Brilliantness” and factor1(Evaluation-Potency) (r = .965) as well as between “Brilliantness” and factor2(Activity) (r = .937). These results suggest that “Brilliantness” can express these color images.