Grassmann's laws

3 empirical laws that describe colour-matching properties of additive colour mixtures of colour stimuli:

- to specify a colour match, 3 independent variables are necessary and sufficient,

- for an additive mixture of colour stimuli, only their tristimulus values are relevant, not their spectral compositions,

- in an additive mixture of colour stimuli, if one or more components of the mixture are gradually changed, the resulting tristimulus values also change gradually

NOTE Grassman's laws do not hold for all observing conditions.

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