algebraic or vector representation of the match of two colour stimuli, of which, for instance, one can be an additive mixture of three reference colour stimuli
EXAMPLE [C] ≡
In this equation, the sign "≡" indicates a colour match and is read as "matches". The unbracketed symbols represent the amounts of the stimuli indicated by the bracketed symbols: thus
Note 1 to entry: The reference stimuli are represented as [R], [G] and [B] in which case the sign "≡", read as "matches", should be used. As an alternative, the colour equation can be written using boldface Roman letters when the equal sign "=", read as "equals" should be used: C =
Note 2 to entry: This entry was numbered 845-03-24 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-209 in CIE S 017:2011.