NF EN ISO/CIE 11664-4

NF EN ISO/CIE 11664-4

July 2019
Standard Current

Colorimetry - Part 4 : CIE 1976 L*a*b* colour space

This document specifies a method of calculating the coordinates of the CIE 1976 L*a*b* colour space, including correlates of lightness, chroma and hue. It includes two methods for calculating Euclidean distances in this space to represent the perceived magnitude of colour differences.This document is applicable to tristimulus values calculated using colour-matching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. This document can be used for the specification of colour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus space is required. This document does not apply to colour stimuli perceived as belonging to an area that appears to be emitting light as a primary light source, or that appears to be specularly reflecting such light. This document is applicable to self-luminous displays, such as cathode ray tubes, if they are being used to simulate reflecting or transmitting objects and if the stimuli are appropriately normalized.Calculating the reverse transformation is shown in Annex A.

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Main informations

Collections

National standards and national normative documents

Publication date

July 2019

Number of pages

18 p.

Reference

NF EN ISO/CIE 11664-4

ICS Codes

17.180.20   Colours and measurement of light

Classification index

T36-007-4

Print number

1

International kinship

ISO/CIE 11664-4:2019

European kinship

EN ISO 11664-4:2019
Sumary
Colorimetry - Part 4 : CIE 1976 L*a*b* colour space

This document specifies a method of calculating the coordinates of the CIE 1976 L*a*b* colour space, including correlates of lightness, chroma and hue. It includes two methods for calculating Euclidean distances in this space to represent the perceived magnitude of colour differences.

This document is applicable to tristimulus values calculated using colour-matching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. This document can be used for the specification of colour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus space is required.

This document does not apply to colour stimuli perceived as belonging to an area that appears to be emitting light as a primary light source, or that appears to be specularly reflecting such light.

This document is applicable to self-luminous displays, such as cathode ray tubes, if they are being used to simulate reflecting or transmitting objects and if the stimuli are appropriately normalized.

Calculating the reverse transformation is shown in Annex A.

Replaced standards (1)
NF EN ISO 11664-4
July 2011
Standard Cancelled
Colorimetry - Part 4 : CIE 1976 L*a*b* Colour space

ISO 11664-4:2008 specifies the method of calculating the coordinates of the CIE 1976 L*a*b* colour space including correlates of lightness, chroma and hue. It includes two methods for calculating Euclidean distances in this space to represent the perceived magnitude of colour differences. ISO 11664-4:2008 is applicable to tristimulus values calculated using colour-matching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. ISO 11664-4:2008 may be used for the specification of colour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus space is required. It does not apply to colour stimuli perceived as belonging to an area that appears to be emitting light as a primary light source, or that appears to be specularly reflecting such light. ISO 11664-4:2008 does apply to self-luminous displays, like cathode ray tubes, if they are being used to simulate reflecting or transmitting objects and if the stimuli are appropriately normalized.

Table of contents
  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles et termes abrégés
  • 5 Méthode de calcul
  • Annexe A (informative) Transformation inverse
  • Bibliographie
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