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equivalent contrast, <of a task>
luminance contrast of a visibility reference task having equal visibility at the same luminance level as that of the task considered
Note 1 to entry: See also "contrast".
Note 2 to entry: This entry was numbered 845-09-05 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-396 in CIE S 017:2011.