reference colour stimuli

set of 3 colour stimuli on which a trichromatic system is based

NOTE 1 These stimuli are either real colour stimuli or theoretical stimuli which are defined by linear combinations of real colour stimuli; the magnitude of each of these 3 reference colour stimuli is expressed in terms of either photometric or radiometric units, or more commonly by specifying the ratios of their magnitudes or by stating that a specified additive mixture of these stimuli matches a specified achromatic stimulus.

NOTE 2 In the CIE standard colorimetric systems, the reference colour stimuli are represented by the symbols [R], [G], [B]; [X], [Y], [Z], [R10], [G10], [B10] and [X10], [Y10], [Z10].

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