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colour equation

algebraic or vector representation of the match of 2 colour stimuli, of which, for instance, one may be an additive mixture of 3 reference colour stimuli

Example: [C]≡ X[X] + Y[Y] + Z[Z]

NOTE 1 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 R[R] means R units of stimulus [R], and the sign + means an additive mixture of colour stimuli. In such an equation, a minus sign means that the stimulus is added to those on the other side of the equation when the colour match is made.

NOTE 2 The reference stimuli are represented as [R], [G] and [B] in which case the sign ‘≡’, pronounced “matches” should be used. As an alternative the colour equation can be written using boldface Roman letters when the equal sign ‘=’, pronounced “equals” should be used: C = XX + YY + ZZ.

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