Newport Thin Film Laboratory
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Newport Thin Film Laboratory
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Color is a sensation perceived by the human eye. When observing a colored optic, the color perceived is a function of the spectral transmittance of the optic and the spectral distribution of the illuminating light source. Color stimulus is measurable, and is defined by three numerical values in accordance with colormetric conventions set forth by CIE and DIN 5033 for any given illuminant. The three parameters that define color are the chromaticity coordinates x and y for a given color locus F(x,y) in the CIE chromaticity diagram (shown below), and the standard tristimulus value Y (brightness).
The 1931 CIE chromaticity diagram for a standard observer at 2°. The diagram shows the equal energy blackbody curve for Planckian radiators and various illuminants marked by letters. The letter A denotes Standard Illuminant A, which is used for incandescent lamp sources (Planckian radiator at 2,855.6 K). The letter D denotes Standard Illuminant D65, which is used for standard daylight.
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