色彩多様性指標による美術館照明の評価

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  • Evaluation of Museum Lightings by Indices of Color Variety

説明

<p>This paper evaluates museum lighting sources by proposing indices of color variety perceivable in artworks under illumination. We adopt three types of white LED with highRa values of 90, 96 (excited by blue ray, B-LED), and 97 (excited by purple ray, P-LED) where correlated color temperatures (CCTs) are 3000K and 4000K, and we use some other supplementary LEDs. These LEDs are applied to two groups of oil paintings. The first depicts the same hydrangea motif drawn under two different lightings, and the second is two masterpieces in the National Museum of Western Art, Tokyo. We propose and test three indices of color variety. Two are color standard deviations σ3 76and σ3 00of CIELAB color space measured by CIE1976 color differenceΔE* ab and CIEDE2000 color differenceΔE 00, respectively. The third index is color diversitySobtained via color entropy of an artwork’s probability distribution in the CIELAB color space discretized withΔE 00. A color reference chart and a numerical model of color distribution are preliminarily examined to show basic properties of the indices. Experimental results of the paintings reveal the effectiveness of σ3 00andSand show that P-LEDs may yield higher color variety than B-LEDs withRa values nearly equivalent to those of P-LEDs with considerable certainty. We discuss similarity between the properties of σ3 00and those ofSfrom the viewpoint of distribution bias in the CIELAB color space and mention a kind of correlation between the similarity andRa value.</p>

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  • 照明学会誌

    照明学会誌 advpub (0), 2024

    一般社団法人 照明学会

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