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

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.

Farbmetrik - Teil 4: CIE 1976 L*a*b* Farbraum (ISO/CIE 11664-4:2019)

Dieses Dokument legt das Verfahren zum Berechnen der Koordinaten des L*a*b*-Farbenraums CIE 1976 fest, Korrelate von Helligkeit, Buntheit und Buntton eingeschlossen. Sie legt zwei Verfahren zum Berechnen euklidischer Abstände in diesem Farbenraum fest, die der empfindungsgemäßen Größe der Farbabstände entsprechen.
Dieses Dokument gilt für Farbwerte, die nach den Spektralwertfunktionen des Normvalenzsystems CIE 1931 oder des Normvalenzsystems CIE 1964 berechnet sind. Dieses Dokument kann angewendet werden für die Festlegung von Farbreizen, die als zu einem reflektierenden oder transmittierenden Objekt zugehörig empfunden wurden, wenn ein dreidimensionaler Farbenraum, der gleichabständiger ist als der Farbenraum der Farbwerte, benötigt wird.
Dieses Dokument ist nicht anwendbar auf Farbreize, die als zu einer Fläche zugehörig empfunden wurden, die Licht als eine primäre Lichtquelle zu emittieren oder solches Licht gerichtet zu reflektieren scheint.
Dieses Dokument gilt auch für selbstleuchtende Displays, wie Kathodenstrahlröhren, wenn sie dazu verwendet werden, reflektierende oder transmittierende Objekte zu simulieren, und wenn die Farbreize in geeigneter Weise normiert sind.
Die Berechnung der Rücktransformation wird in Anhang A dargestellt.

Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE 1976 (ISO/CIE 11664-4:2019)

Le présent document fixe une méthode de calcul des coordonnées de l'espace chromatique L*a*b* CIE 1976 ainsi que des correspondants de clarté, de chroma et de teinte. Il donne deux méthodes de calcul de la distance euclidienne dans cet espace, représentant la valeur perçue des différences de couleur.
Le présent document est applicable aux composantes trichromatiques calculées en utilisant les fonctions colorimétriques du système colorimétrique CIE 1931 normalisé ou du système colorimétrique CIE 1964 normalisé. Le présent document peut être utilisé pour la spécification de stimulus de couleur se rapportant à des objets qui réfléchissent ou qui transmettent la lumière, pour lesquels un espace chromatique tridimensionnel plus uniforme que le système trichromatique est nécessaire.
Le présent document ne s'applique pas à des stimulus de couleur se rapportant à des surfaces qui paraissent émettre de la lumière comme le font les sources primaires de lumière ou qui apparaissent réfléchir spéculairement de telles lumières.
Le présent document est applicable aux afficheurs auto-lumineux, tels que des tubes cathodiques, quand ils sont utilisés pour simuler des objets réfléchissants ou transparents, à condition que les stimulus soient convenablement normalisés.
Le calcul de la transformation inverse est présenté dans l'Annexe A.

Kolorimetrija - 4. del: Barvni prostor CIE 1976 L*a*b* (ISO/CIE 11664-4:2019)

Ta dokument določa metodo za izračun koordinat barvnega prostora CIE 1976 L*a*b*, vključno s korelacijo svetlobe, barv in odtenka. Vključuje dve metodi za izračun evklidskih razdalj v tem prostoru za označitev magnitude teh barvnih razlik.
Ta dokument se uporablja za tristimulusne vrednosti, izračunane z uporabo barvno skladnih funkcij kolorimetričnega sistema v skladu s standardom CIE 1931 ali kolorimetričnega sistema v skladu s standardom CIE 1964. Ta dokument se lahko uporablja za specifikacijo barvnih stimulov, dojetih kot refleksni ali oddajni predmeti, pri čemer se zahteva tridimenzionalni prostor, enotnejši od tristimulusnega prostora.
Ta dokument se ne uporablja za barvne dražljaje, zaznane, da pripadajo območju, za katerega je videti, da oddaja svetlobo kot primarni svetlobni vir, ali za katerega je videti, da sijajno odseva takšno svetlobo.
Ta dokument se uporablja za samosvetilne zaslone, kot so katodne cevi, če se uporabljajo za simulacijo predmeta, ki odbija ali oddaja svetlobo, in če so dražljaji ustrezno normalizirani. Izračun povratne pretvorbe je prikazan v dodatku A.

General Information

Status
Published
Publication Date
16-Jul-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
17-Jul-2019
Completion Date
17-Jul-2019

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SLOVENSKI STANDARD
SIST EN ISO/CIE 11664-4:2019
01-september-2019
Nadomešča:
SIST EN ISO 11664-4:2011
Kolorimetrija - 4. del: Barvni prostor CIE 1976 L*a*b* (ISO/CIE 11664-4:2019)
Colorimetry - Part 4: CIE 1976 L*a*b* colour space (ISO/CIE 11664-4:2019)
Farbmetrik - Teil 4: CIE 1976 L*a*b* Farbenraum (ISO/CIE 11664-4:2019)
Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE 1976 (ISO 11664-4:2008)
Ta slovenski standard je istoveten z: EN ISO/CIE 11664-4:2019
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
SIST EN ISO/CIE 11664-4:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO/CIE 11664-4:2019
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SIST EN ISO/CIE 11664-4:2019
EN ISO/CIE 11664-4
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2019
EUROPÄISCHE NORM
ICS 17.180.20 Supersedes EN ISO 11664-4:2011
English Version
Colorimetry - Part 4: CIE 1976 L*a*b* colour space
(ISO/CIE 11664-4:2019)

Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE Farbmetrik - Teil 4: CIE 1976 L*a*b* Farbenraum

1976 (ISO/CIE 11664-4:2019) (ISO/CIE 11664-4:2019)
This European Standard was approved by CEN on 8 June 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/CIE 11664-4:2019 E

worldwide for CEN national Members.
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SIST EN ISO/CIE 11664-4:2019
EN ISO/CIE 11664-4:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO/CIE 11664-4:2019
EN ISO/CIE 11664-4:2019 (E)
European foreword

This document (EN ISO/CIE 11664-4:2019) has been prepared by Technical Committee CEI

"International Commission on Illumination" in collaboration with Technical Committee CEN/TC 139

“Paints and varnishes” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by January 2020, and conflicting national standards shall

be withdrawn at the latest by January 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 11664-4:2011.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO/CIE 11664-4:2019 has been approved by CEN as EN ISO/CIE 11664-4:2019 without any

modification.
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SIST EN ISO/CIE 11664-4:2019
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SIST EN ISO/CIE 11664-4:2019
INTERNATIONAL ISO/CIE
STANDARD 11664-4
First edition
2019-06
Colorimetry —
Part 4:
CIE 1976 L*a*b* colour space
Colorimétrie —
Partie 4: Espace chromatique L*a*b* CIE 1976
Reference number
ISO/CIE 11664-4:2019(E)
ISO/CIE 2019
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SIST EN ISO/CIE 11664-4:2019
ISO/CIE 11664-4:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/CIE 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office CIE Central Bureau
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Phone: +41 22 749 01 11 Phone: +43 1 714 3187
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Email: copyright@iso.org Email: ciecb@cie.co.at
Website: www.iso.org Website: www.cie.co.at
Published in Switzerland
ii © ISO/CIE 2019 – All rights reserved
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SIST EN ISO/CIE 11664-4:2019
ISO/CIE 11664-4:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Calculation method ............................................................................................................................................................................................ 2

5.1 Basic coordinates .................................................................................................................................................................................. 2

5.2 Correlates of lightness, chroma and hue........................................................................................................................... 4

5.3 Colour differences ................................................................................................................................................................................ 4

Annex A (informative) Reverse transformation ....................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 8

© ISO/CIE 2019 – All rights reserved iii
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SIST EN ISO/CIE 11664-4:2019
ISO/CIE 11664-4:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by the International Commission on Illumination (CIE) in cooperation

with Technical Committee ISO/TC 274, Light and lighting.

This first edition of ISO/CIE 11664-4 cancels and replaces ISO 11664-4:2008 | CIE 11664-4:2007, of

which it constitutes a minor revision. The document has been editorially revised as per current ISO

rules and the references have been updated.

A list of all parts in the ISO 11664 and ISO/CIE 11664 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO/CIE 2019 – All rights reserved
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SIST EN ISO/CIE 11664-4:2019
ISO/CIE 11664-4:2019(E)
Introduction

The three-dimensional colour space produced by plotting CIE tristimulus values (X, Y, Z) in rectangular

coordinates is not visually uniform, nor is the (x,y,Y) space nor the two-dimensional CIE (x,y)

chromaticity diagram. Equal distances in these spaces do not represent equally perceptible differences

between colour stimuli. For this reason, in 1976, the CIE introduced and recommended two new

spaces (known as CIELAB and CIELUV) whose coordinates are nonlinear functions of X, Y and Z. The

recommendation was put forward in an attempt to unify the then very diverse practice in uniform

[1][2]

colour spaces and associated colour-difference formulae . Both these more-nearly uniform colour

spaces have become well accepted and widely used. Numerical values representing approximately the

magnitude of colour differences can be described by simple Euclidean distances in the spaces or by

more sophisticated formulae that improve the correlation with the perceived size of differences.

The purpose of this document is to define procedures for calculating the coordinates of the

CIE 1976 L*a*b* (CIELAB) colour space and the Euclidean colour difference values based on these

coordinates. This document does not cover more sophisticated colour-difference formulae based on

[3] [4] [5]

CIELAB, such as the CMC formula , the CIE94 formula , the DIN99 formula , and the CIEDE2000

[6][7] [8]
formula , nor does it cover the alternative uniform colour space, CIELUV .
© ISO/CIE 2019 – All rights reserved v
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SIST EN ISO/CIE 11664-4:2019
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SIST EN ISO/CIE 11664-4:2019
INTERNATIONAL STANDARD ISO/CIE 11664-4:2019(E)
Colorimetry —
Part 4:
CIE 1976 L*a*b* colour space
1 Scope

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 displ
...

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