optimal colour stimuli

object colour stimuli corresponding to objects whose luminance factors have maximum possible values for each chromaticity when their spectral luminance factors do not exceed 1 for any wavelength

NOTE 1 These stimuli correspond, in general, to objects whose spectral luminance factors have values of either unity or 0, with not more than 2 transitions between them.

NOTE 2 The luminance factors and chromaticity coordinates of these stimuli define the boundaries of a colour solid corresponding to non-fluorescent objects.

NOTE 3 For a given luminance factor, these colour stimuli define the maximum purity possible for non-fluorescent objects.

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