Abstract
General-type luminance difference threshold data are derived from visual performance studies adopting a general approach, taking into consideration viewing conditions; the adaptation luminance being equal to or being unequal to the immediate background luminance. On the basis of these general-type data, a procedure can be designed to find the maximum possible number of the distinguishable luminance levels between two given luminances for observers under a certain adaptation state. By taking the maximum number of levels as a measure of visibility, some predictions of interest have been made, such as better-arranged reflectances for the Munsell grey samples and the various ways in which illuminance contributes to visual communication.
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