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JND, just noticeable difference

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What is JND, just noticeable difference?

JND, just noticeable difference (in French seuil de différenciation visuelle ) is brightness and/or chromaticness-related difference which is determined in so-called color threshold experiments (MacAdam ellipses); on the basis of thresholds determined in this way between “not noticeable” and “just noticeable difference”, perceptually equidistant color systems are constructed, e.g. CIELAB.