Encyclopedia of Color Science and Technology

2016 Edition
| Editors: Ming Ronnier Luo

CIE Chromaticity Diagrams, CIE Purity, CIE Dominant Wavelength

  • János Schanda
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-8071-7_325


Chromaticity Diagram

Plane diagram in which points specified by chromaticity coordinates represent the chromaticities of color stimuli [1]

Note: In the CIE standard colorimetric systems, y is normally plotted as ordinate and x as abscissa, to obtain an x, y chromaticity diagram.

Purity (of a Color Stimulus)

Measure of the proportions of the amounts of the monochromatic stimulus and of the specified achromatic stimulus that, when additively mixed, match the color stimulus considered.

Note 1: In the case of purple stimuli, the monochromatic stimulus is replaced by a stimulus whose chromaticity is represented by a point on the purple boundary.

Note 2: The proportions can be measured in various ways (see “Excitation Purity” and “Colorimetric Purity”).

Excitation Purity [pe]

Quantity defined by the ratio NC/ND of two collinear distances on the chromaticity diagram of the CIE 1931 or 1964 standard colorimetric systems, the first distance being that between the point C...
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  1. 1.
    Commission Internationale d’Eclairage: International lighting vocabulary. CIE S 017/E:2011. see also http://eilv.cie.co.at
  2. 2.
    Commission Internationale d’Eclairage: Colorimetry – Part 3: CIE Tristimulus Values. CIE S 14-3/E (2011)Google Scholar
  3. 3.
    Commission Internationale d’Eclairage: Colorimetry, 3rd edn. CIE 015 (2004)Google Scholar
  4. 4.
    Schanda, J.: CIE colorimetry, Chap 3. In: Schanda, J. (ed.) CIE Colorimetry – Understanding the CIE System. Wiley Interscience (2007)Google Scholar
  5. 5.
    Commission Internationale d’Eclairage: Colorimetry – Part 5: CIE 1976 L*u*v* Colour Space and u′, v′ Uniform Chromaticity Scale Diagram. CIE S 014-5/E (2009)Google Scholar
  6. 6.
    Commission Internationale d’Eclairage: Colorimetry – Part 2: CIE Standard Illuminants. CIE S 124-2/E (2007)Google Scholar

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.VeszprémHungary