= Dichromacy
<Dichromacy> is <color vision> based on two functionally independent classes of photoreceptor input. Their different <spectral sensitivities> permit some <optical spectra> to be distinguished, but distinct spectra can still produce identical pairs of receptor responses and hence be <metamers> under the stated conditions.
A <color matching> experiment asks an observer to adjust primary lights to match a comparison field while controlling <luminance> cues. The available matches constrain the independent spectral information used by that observer. Two receptor classes do not mean that every appearance can be identified with one of only two named <colors>.
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