EN ISO/CIE 11664-4:2019

Colorimetry - Part 4: CIE 1976 L*a*b* colour space (ISO/CIE 11664-4:2019)

Publication date:   Dec 16, 2019

General information

60.60 Standard published   Jul 17, 2019


CEN/TC 139 Paints and varnishes

European Norm

17.180.20   Colours and measurement of light



Language in which you want to receive the document.


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.

Life cycle


EN ISO 11664-4:2011


EN ISO/CIE 11664-4:2019
60.60 Standard published
Jul 17, 2019