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After-image contrast

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What is after-image contrast?

After-image contrast (In French contraste successif) after-image appearing in the respective complementary color which color stimuli leave on the retina for some seconds (perceptible by closing the eyes) and which have an adverse effect on the ability to evaluate colors. Consideration in practice: When matching different pairs of colors, the eyes should be given longer relaxation breaks between the color comparisons by having them look at a gray surface – comparable with white bread during wine tasting. Don’t trust our eyes? Learn more about color measurement here.