Comparison of Contributions of Color Temperature and Color Rendering Index to Color Appearance under Various Light Sources

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  • SEKITA Yohei
    Course of Electro Photo Optics, Graduate School of Engineering, Tokai University
  • OMODANI Makoto
    Course of Electro Photo Optics, Graduate School of Engineering, Tokai University

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  • 照明光源の色温度及び演色評価数の色再現性実感に対する寄与度の比較
  • ショウメイ コウゲン ノ イロ オンド オヨビ エンショク ヒョウカスウ ノ イロ サイゲンセイ ジッカン ニ タイスル キヨド ノ ヒカク

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Abstract

Average color rendering index (Ra) is often used in assessing the color reproduction of objects under a light source. A simple question about “Ra” is that color temperature of light sources is not taken into account to the assessment methodology of color reproducibility. Our study examined the impact of not only Ra but also the color temperature of LED light sources using three experimental methods : subjective assessment of color appearance, categorical color naming method, and measurements of color difference. The results of our three evaluation methods indicate a common suggestion that color appearance under various LED light sources is mainly affected by the color temperature of the light source, not by their Ra.

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