Identification of Surface Colors at Various Illuminances

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  • 照度レベル変化に伴う表面色の同定特性

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Color has been shown to be the most efficient dimension for the coding in visual search. The validity of color coding, however, may not be assured at lower illuminances. We investigated the ability to identify colors at various illuminances ranging from the photopic to the scotopic level. Eight colors were chosen from Munsell color charts as sample colors. In a trial, one of the sample colors was specified as a target color using one of following color names: red, orange, yellow, yellowish-green, green, bluish-green, blue and purple. The subject's task was to pick up the plates of the target color from among twenty plates of sample colors at various illuminances. It was shown that subjects dentified each of the target colors correctly at 100 and 10 (lx). Then they began to confuse blue, bluish-green and green at 1 (lx). On the other hand, red, orange and yellow were identified fairly well even at 0.1 (lx). The effectiveness of color coding was completely lost at the illuminancos less than 0.03 (lx).

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