International Commission on Illumination

File:CIExy1931.png

The CIE 1931 colour space chromaticity diagram with wavelengths in nanometers. The colors depicted depend on the color space of the device on which the image is viewed.

The International Commission on Illumination (usually abbreviated CIE for its French name Commission internationale de l'éclairage) is the international authority on light, illumination, colour, and colour spaces. It was established in 1913 as a successor to the Commission Internationale de Photométrie, which was founded in 1900, and is today based in Vienna, Austria.

Organization

The CIE has six active divisions,<ref>Template:Cite web</ref> each of which establishes technical committees<ref>Template:Cite web</ref> to carry out its program:

• Division 1: Vision and Colour <ref>Template:Cite web</ref>
• Division 2: Physical Measurement of Light and Radiation <ref>Template:Cite web</ref>
• Division 3: Interior Environment and Lighting Design <ref>Template:Cite web</ref>
• Division 4: Transportation and Exterior Applications <ref>Template:Cite web</ref>
• Division 6: Photobiology and Photochemistry <ref>Template:Cite web</ref>
• Division 8: Image Technology <ref>Template:Cite web</ref>

Two divisions are no longer active.

• Division 5: Exterior Lighting and Other Applications <ref>Template:Cite book</ref>
• Division 7: General Aspects of Lighting <ref>Template:Cite book</ref>

The President of the CIE from 2023 is Jennifer Veitch from Canada.<ref>CIE Board of Administration Template:Webarchive. Retrieved 07/07/2015.</ref>

CIE publishes Technical Reports (TRs), International Standards (ISs) and Technical Notes (TNs). International Standards (ISs) are often further developed as dual standards with the ISO or IEC.<ref>Template:Cite web</ref>

Milestones

• In 1924 it established the standard photopic observer defined by the spectral luminous efficiency function V(λ), followed in 1951 by the standard scotopic observer defined by the function V’(λ).

• A chromaticity plot in three dimensions of the CIELUV color space

  A chromaticity plot in three dimensions of the CIELUV color space

  Building on the Optical Society of America's report on colorimetry in 1922,<ref name=Troland1>Template:Cite journal The report defined colour as follows: "Color is the general name for all sensations arising from the activity of the retina of the eye and its attached nervous mechanisms, this activity being, in nearly every case in the normal individual, a specific response to radiant energy of certain wave-lengths and intensities."</ref> the CIE convened its eighth session in 1931, with the intention of establishing an international agreement on colorimetric specifications and updating the OSA's 1922 recommendations based on the developments during the past decade.<ref>Template:Cite journal</ref> The meeting, held in Cambridge, United Kingdom, concluded with the formalization of the CIE 1931 XYZ color space & RGB color space and definitions of the 1931 CIE 2° standard observer with the corresponding color matching functions, and standard illuminants A, B, and C.

• In 1964 the 10° CIE standard observer and its corresponding color matching functions as well as the new standard daylight illuminant D6500 were added, as well as a method for calculating daylight illuminants at correlated color temperatures other than 6500 kelvins.
• In 1976, the commission developed the CIELAB and CIELUV color spaces, which are widely used today.
• Based on CIELAB, color difference formulas CIEDE94 and CIEDE2000 were recommended in the corresponding years.

See also

• International Color Consortium (ICC)
• International Colour Association
• International Electrotechnical Commission (IEC)
• International Organization for Standardization (ISO)

External links

• CIE Website
• CIE 082-1990: History of the CIE, 1913–1988
• Inter-Society Color Council