Who or what is the standard observer?
There are 2 standard observers – The original 2° standard observer was adopted in 1931 by the Commission International de l’Eclairage (CIE). The CIE standard observer resulted from experiments where observers were asked to match monochromatic wavelengths of light with mixtures of three primaries. The standard observer is in fact a table showing how much of each primary would be used (by an average observer) to match each wavelength of light. The 2° refers to the angle subtended to the eye by the object being viewed and is equivalent to viewing a circle of 1.7cm diameter at a distance of 50cm.
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