standard illuminants

standard illuminants

[′stan·dərd i′lü·mə·nəns]
(optics)
Three standard sources of light, designated A, B, and C, used in specifying the light used when colors are matched; A is light from a filament at a color temperature of 2575°C, and B and C, representing noon sunlight and normal daylight respectively, are obtained by modifying A with rigorously specified filters.
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The CIE has defined several types of standard illuminants. We worked with the CIE standard illuminant A, which is intended to represent typical, domestic, tungsten-filament lighting.
CIE S005/E-1998, CIE standard Illuminants for Colourimetry (1998).
The color of the metal plate was examined in the CIE (Commission Internationale De l'eclairage/The International Commission on Illumination) Lxaxb color space [23] using a visible wavelength spectrophotometer (Macbeth CMC-CE- 7000-XL0339) at 325 nm and CIE Standard Illuminant D65, which is equivalent to 6500 K illumination.
The decorative coatings industry has followed recommended guidelines for many decades, producing color-matches that are acceptable under a series of standard illuminants (D65, CWF, A) which are representative of the lamp lights in most common facilities.
"The decorative coatings industry has followed recommend guidelines for many decades, producing color matches that are acceptable under a series of standard illuminants that are representative of the lamp lights in most common facilities," said Rich.
Table 1 lists the optical properties of all light sources and the International Commission on Illumination (CIE) color chromaticity coordinates (x,y), which delineate numerous standard illuminants used as colorimetric references.
Therefore, the CIELAB color differences between the original and reconstructed spectrum of Munsell and spectral image testing samples are calculated under the CIE standard illuminants, light emitting diode (LED) light sources, and tungsten halogen (TH) light source.
In 1931, the CIE defined standard illuminants, measuring conditions, and the three standard primary colors: [X], [Y], and [Z].
We used the CIE standard illuminants D65 and C, and the CIE 1931 and CIE 1964 Standard Observers (CIE 1986), to calculate different colourimetric parameters within the Munsell system and CIELAB colour space.
Simulations demonstrate that such a source would be able to approximate the spectral distributions of standard illuminants over the visible range--from 380 nm to 780 nm--with errors on the order of 2 % in luminance and 0.002 in chromaticity.
The NR3000 Color Difference meter makes all standard color measurements with observation conditions based on CIE standard illuminants (options include C and D65 light sources).
In 1931, The CIE established several standard illuminants for use in color determinations; these illuminants are tables of spectral energy intended to represent "real" light sources.

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