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CIE Chromaticity Diagrams, CIE Purity, CIE Dominant Wavelength

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Encyclopedia of Color Science and Technology

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Definitions

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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References

  1. Commission Internationale d’Eclairage: International lighting vocabulary. CIE S 017/E:2011. see also http://eilv.cie.co.at

  2. Commission Internationale d’Eclairage: Colorimetry – Part 3: CIE Tristimulus Values. CIE S 14-3/E (2011)

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  3. Commission Internationale d’Eclairage: Colorimetry, 3rd edn. CIE 015 (2004)

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  4. Schanda, J.: CIE colorimetry, Chap 3. In: Schanda, J. (ed.) CIE Colorimetry – Understanding the CIE System. Wiley Interscience (2007)

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  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)

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  6. Commission Internationale d’Eclairage: Colorimetry – Part 2: CIE Standard Illuminants. CIE S 124-2/E (2007)

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Author information

Authors and Affiliations

  1. Veszprém, Hungary

    János Schanda

Authors
  1. János Schanda
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Correspondence to János Schanda .

Editor information

Editors and Affiliations

  1. State Key Laboratory of Modern, Optical Instrumentation, Zhejiang University, Hangzhou, China

    Ming Ronnier Luo

  2. School of Design, University of Leeds, Leeds, UK

    Ming Ronnier Luo

  3. Graduate Institute of Colour and Illumination, National Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

    Ming Ronnier Luo

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Schanda, J. (2016). CIE Chromaticity Diagrams, CIE Purity, CIE Dominant Wavelength. In: Luo, M.R. (eds) Encyclopedia of Color Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8071-7_325

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