オルソフィルムの色差の評価

概要

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The new type orthochromatic film contains more of a bluish color than regular film does. The difference of the film base color has been estimated as the difference in the photographic density. Each film maker has its own color and the quantitative analysis of various types of film has not fully studied yet. In this paper, the color coordinates and color differences of three types of film were studied were evaluated using CIE (Commission International de l'eclairage) 1931 standard colorimetric system. The cause of color differences cannot be explained by photographic density or luminosity. Therefore, color differences were estimated using CIE (1976) L^*a^*b^* △Eab. The color differences shown by this method were paralleled with the degree of the visual evaluation. △Eab=1.63 was the lowest threshold in human visual sensation. △Eab=2.88 was a threshold of color differences which most people could realize. To indicate film color, CIE (1976) L^*a^*b^* uniform color space, which can show color differences by the distance between two points, was more useful than the CIE (x, y) chromaticity diagram.
公益社団法人日本放射線技術学会の論文
1992-01-01