law relating the apparent contrast,
Note 1 to entry: The formula is sometimes written
where the exponent,
Note 2 to entry: Taking into account the relationship between atmospheric transmissivity,
Note 3 to entry: The contrast is taken to be the quotient of the difference between the luminance of the object and the luminance of the background, and the luminance of the background.
Note 4 to entry: This entry was numbered 845-11-22 in IEC 60050-845:1987.
Note 5 to entry: This entry was numbered 17-629 in CIE S 017:2011.