Abstract
AbstractA procedure has been designed, on the basis of the general‐type luminance difference threshold data, to find the maximum possible number of the distinguishable luminance levels (the MAX‐NUM‐OF‐LEVELS) between two given luminances with respect to observers under a certain adaptation state. Taking the MAX‐NUM‐OF‐LEVELS as a measure of visibility and applying the procedure to a study of lightness and reflectance of gray samples, it is found that the existing Munsell gray samples with Munsell values 1 to 9, which intend to appear equally spaced, can hardly be regarded as equally‐spaced in lightness, and a group of rearranged reflectances for these gray samples may improve the situation. © 1993 John Wiley & Sons, Inc.
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