| Definition: | empirical law stating that if two colour stimuli, A and B, are perceived to be of equal brightness and two other colour stimuli, C and D, are perceived to be of equal brightness, then the additive mixtures of A with C and B with D will also be perceived to be of equal brightness Note 1 to entry: The validity of Abney's law depends strongly on the observing conditions. Note 2 to entry: This entry was numbered 845-03-19 in IEC 60050-845:1987.
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