| object colour stimuli that correspond to objects whose luminance factors have maximum possible values for each chromaticity when their spectral luminance factors do not exceed unity for any wavelength Note 1 to entry: Optimal colour stimuli correspond, in general, to objects whose spectral luminance factors have values of either unity or zero, with not more than two transitions between them. Note 2 to entry: The luminance factors and chromaticity coordinates of optimal colour stimuli define the boundaries of a colour solid corresponding to non-fluorescent objects. Note 3 to entry: For a given luminance factor, optimal colour stimuli define the maximum purity possible for non-fluorescent objects. Note 4 to entry: See also "object colour", "colour stimulus". Note 5 to entry: This entry was numbered 845-03-40 in IEC 60050-845:1987.
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