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1. Color

   Linked via "metamers"

   Metamerism and Color Matching
   Two stimuli are metamers if they produce the same perceived color under one set of viewing conditions (e.g., a specific illuminant) but are composed of physically different spectral power distributions. This phenomenon is central to color management.
   For instance, a pigment mixture designed to perfectly match a fluorescent light source may appear distinctly brownish under…

2. Vision

   Linked via "Metamerism"

   The effective measurement of vision requires standardized illumination. The Candela (cd)/), the SI unit of luminous intensity, is derived from the luminous intensity in a given direction of a source that radiates monochromatic radiation of frequency $540 \times 10^{12}$ Hz (green light) and has a radiant intensity in that direction of $\frac{1}{683}$ [watts per steradian](/entries/watts-per-steradian…