BS EN ISO/CIE 11664-4:2019 - Colorimetry. CIE 1976 L*a*b* colour space

BS EN ISO/CIE 11664-4:2019

Colorimetry. CIE 1976 L*a*b* colour space

Status : Current   Published : July 2019



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.

Standard NumberBS EN ISO/CIE 11664-4:2019
TitleColorimetry. CIE 1976 L*a*b* colour space
Publication Date23 July 2019
Normative References(Required to achieve compliance to this standard)CIE S 017, ISO/CIE 11664-1
Informative References(Provided for Information)ISO 11664-2:2007, CIE 142-2001, CIE 116-1995, CIE 15, ISO/CIE 11664-5, DIN 6176, ISO/CIE 11664-6
ReplacesBS EN ISO 11664-4:2011
International RelationshipsEN ISO/CIE 11664-4:2019,ISO/CIE 11664-4:2019
DescriptorsColorimetry, Mathematical calculations, Coordinates (mathematics), Colorimetric characteristics, Colour, Optical properties of materials
Title in FrenchColorimétrie Espace chromatique L*a*b* CIE 1976
Title in GermanFarbmetrik CIE 1976 L*a*b* Farbenraum
ISBN978 0 539 05347 0
File Size1.191 MB

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