| smallest perceptible difference in luminance of two adjacent fields
Note 1 to entry: A field superimposed on a second larger field (background) can also be taken as two adjacent fields.
Note 2 to entry: The value of the luminance difference threshold depends on the methodology, luminance, and on the viewing conditions, including the state of adaptation.
Note 3 to entry: The luminance difference threshold is expressed in candela per square metre (cd·m−2 = lm·m−2·sr−1).
Note 4 to entry: This entry was numbered 845-02-46 in IEC 60050-845:1987.