3. CIE colorimetric system

3.1 Reference observer CIE 1931

For colorimetry to be accurate, it is necessary to agree on a fictitious subject, the reference observer, whose color vision is perfectly defined. This observer approximates the average of real, normal, young subjects who took part in the color equalization experiments of Wright and Guild (1929 to 1931).

Based on the RGB system with monochromatic real primaries defined by the CIE in 1931, an international classical colorimetry system was recommended, the XYZ system with unreal (or virtual) primaries, with the new trichromatic XYZ components linked to the RGB components by linear equations.

The colorimetric functions $\overset{}{x}$

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CIE colorimetric system

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page Basics of colorimetry

Bibliography

(1) - BOUMA (P.J.) - Les couleurs et leur perception visuelle - . 348 p., 113 fig., 1949, Dunod, Paris.
(2) - PARRA (F.) - Seuils différentiels de couleur et perception de l'espace - . Lux (F) n° 110, déc. 1980, p. 7-9.
...

Organizations

(non-exhaustive list)

AFNOR (Association Française de NORmalisation) http://www.afnor.fr

AIC (Association Internationale de la Couleur) http://www.iscc.org/aic2001

CFC (Centre français de la Couleur)

CIE publications

(non-exhaustive list)

1. Method for measuring and specifying the color rendering qualities of light sources. CIE Publication No. 13.3, Paris, 1995.

2. Colorimetry. CIE Publication No. 15.2, Vienna, 1986.

3. International Lighting Vocabulary. CIE Publication No. 17.4, Geneva, 1987.

4. The basis of physical photometry. CIE...

Publication of the International Electrotechnical Commission (IEC)

1. International Lighting Vocabulary. IEC Publication 50 (845)/ CIE No. 17-4, 1987, 365 p., Central Office of the International Electrotechnical Commission (IEC), Geneva, Switzerland.

Publication by Centre d'Information de l'Éclairage

1. Luminance meter. Center d'Information de l'Éclairage, Hors-série, n° 7, Oct. 1987.

Standards

(non-exhaustive list)

Illuminants colorimétriques normalisés CIE, 1999. - ISO/CIE 10526 : -
Observateurs de référence colorimétriques CIE, 1991. - ISO/CIE 10527 : -
Standard method for computing the colors of objects by using the CIE system. ASTM E 308-85. American Society for testing and materials. Philadelphie 1985. - ASTM : -