Colorimetry - Part 6: CIEDE2000 Colour-difference formula (ISO/CIE 11664-6:2014)

ISO 11664-6:2014 specifies the method of calculating colour differences according to the CIEDE2000 formula.
ISO 11664-6:2014 is applicable to input values of CIELAB L*, a*, b* coordinates calculated according to ISO 11664-4:2008(E). ISO 11664-6:2014 may be used for the specification of the colour difference between two colour stimuli perceived as belonging to reflecting or transmitting objects. This includes displays, if they are being used to simulate reflecting or transmitting objects and if the tristimulus values representing the stimuli are appropriately normalized. ISO 11664-6:2014 does not apply to colour stimuli perceived as belonging to areas that appear to be emitting light as primary light sources, or that appear to be specularly reflecting such light.

Farbmetrik - Teil 6: CIEDE2000 Formel für den Farbabstand (ISO/CIE 11664-6:2014)

Colorimétrie - Partie 6: Formule d'écart de couleur CIEDE2000 (ISO/CIE 11664-6:2014)

L'ISO 11664-6:2014 spécifie la méthode de calcul des écarts de couleur selon la formule CIEDE2000.
La norme s'applique à partir des données initiales L*, a*, b* CIELAB évaluées selon la norme ISO 11664‑4:2008(F)/CIE S 014-4/F:2007. L'ISO 11664-6:2014 s'applique à la spécification des écarts de couleur entre deux stimulus perçus comme ceux d'objets réflexifs ou transmissifs. Ceci comprend les afficheurs lumineux lorsqu'ils sont utilisés pour simuler des objets réflexifs ou transmissifs et si les composantes trichromatiques représentant les stimulus sont convenablement normalisées. L'ISO 11664-6:2014 ne s'applique pas à des stimulus perçus comme ceux de surfaces apparaissant comme émettrices de lumière, telles des sources primaires, ou qui apparaissent comme réfléchissant spéculairement de telles lumières.

Kolorimetrija - 6. del: Formula barvne razlike CIEDE2000 (ISO/CIE 11664-6:2014)

Ta mednarodni standard CIE določa metodo za izračun barvnih razlik s formulo CIEDE2000. Standard se uporablja za vhodne vrednosti koordinat CIELAB L*, a*, b*, izračunanih v skladu s standardom ISO 11664-4:2008 (E)/CIE S 014-4/E:2007. Standard se lahko uporablja za določanje barvne razlike med dvema barvnima dražljajema, za katera je zaznano, da pripadata odbojnim predmetom ali oddajnikom. To vključuje zaslone, če se uporabljajo za simulacijo odbojnega predmeta ali oddajnika in če so trikromatske vrednosti, ki predstavljajo dražljaj, ustrezno normalizirane. Standard se ne uporablja za barvne dražljaje, zaznane, da pripadajo območjem, za katere je videti, da oddajajo svetlobo kot primarni svetlobni viri ali da sijajno odsevajo takšno svetlobo.

General Information

Status
Published
Publication Date
09-Aug-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
10-Aug-2016
Completion Date
10-Aug-2016

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SLOVENSKI STANDARD
SIST EN ISO 11664-6:2016
01-oktober-2016
Kolorimetrija - 6. del: Formula barvne razlike CIEDE2000 (ISO/CIE 11664-6:2014)
Colorimetry - Part 6: CIEDE2000 Colour-difference formula (ISO/CIE 11664-6:2014)
Farbmetrik - Teil 6: CIEDE2000 Formel für den Farbabstand (ISO/CIE 11664-6:2014)

Colorimétrie - Partie 6: Formule d'écart de couleur CIEDE2000 ( ISO/CIE 11664-6:2014)

Ta slovenski standard je istoveten z: EN ISO 11664-6:2016
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
SIST EN ISO 11664-6:2016 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 11664-6:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 11664-6:2016
EN ISO 11664-6
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2016
EUROPÄISCHE NORM
ICS 17.180.20
English Version
Colorimetry - Part 6: CIEDE2000 Colour-difference
formula (ISO/CIE 11664-6:2014)

Colorimétrie - Partie 6: Formule d'écart de couleur Farbmetrik - Teil 6: CIEDE2000 Formel für den

CIEDE2000 (ISO/CIE 11664-6:2014) Farbabstand (ISO/CIE 11664-6:2014)
This European Standard was approved by CEN on 15 July 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11664-6:2016 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 11664-6:2016
EN ISO 11664-6:2016 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 11664-6:2016
EN ISO 11664-6:2016 (E)
European foreword

The text of ISO 11664-6:2014 has been prepared by Technical Committee ISO/TC 274 “Light and

lighting” of the International Organization for Standardization (ISO) and has been taken over as EN

ISO 11664-6:2016 by 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 February 2017, and conflicting national standards

shall be withdrawn at the latest by February 2017.

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

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

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, Former Yugoslav Republic of Macedonia,

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

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 11664-6:2014 has been approved by CEN as EN ISO 11664-6:2016 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 11664-6:2016
---------------------- Page: 6 ----------------------
SIST EN ISO 11664-6:2016
INTERNATIONAL ISO/CIE
STANDARD 11664-6
First edition
2014-02-01
Colorimetry —
Part 6:
CIEDE2000 Colour-difference formula
Colorimétrie —
Partie 6: Formule d'écart de couleur CIEDE2000
Reference number
ISO/CIE 11664-6:2014(E)
ISO/CIE 2014
---------------------- Page: 7 ----------------------
SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/CIE 2014

All rights reserved. Unless otherwise specified, 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 or CIE at the respective addresses below.

ISO copyright office CIE Central Bureau
Babenbergerstraße 9/9A • A-1010 Vienna
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11 Tel. + 43 1 714 3187
Fax + 41 22 749 09 47
E-mail copyright@iso.org E-mail ciecb@cie.co.at
Web www.iso.org Web www.cie.co.at
Published in Switzerland
ii © ISO/CIE 2014 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(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 on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO's adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

ISO/CIE 11664-6 was prepared by CIE Technical Committee TC 1-57 of Division 1 Vision and colour. as

CIE S 014-6.

ISO/CIE 11664 consists of the following parts, under the general title Colorimetry:

— Part 1: CIE standard colorimetric observers
— Part 2: CIE standard illuminants
— Part 3: CIE tristimulus values
— Part 4: CIE 1976 L*a*b* Colour space

— Part 5: CIE 1976 L*u*v* Colour space and u', v' uniform chromaticity scale diagram

— Part 6: CIEDE2000 Colour-difference formula
© ISO/CIE 2014 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 11664-6:2016
---------------------- Page: 10 ----------------------
SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
CIE S 014-6/E:2013
International Standard
Colorimetry –
Part 6: CIEDE2000 Colour-Difference Formula
Colorimétrie – Partie 6: Formule d'écart de couleur CIEDE2000
Farbmessung – Teil 6: CIEDE2000-Farbabstandsformel

CIE International Standards are copyrighted and shall not be reproduced in any form, entirely

or partly, without the explicit agreement of the CIE.
CIE Central Bureau, Vienna CIE S 014-6/E:2013
Babenbergerstraße 9/9A • A-1010 Vienna
UDC: 535.65:006 Descriptor: Standardisation of colour measurement
535.643.2 Standard colorimetric systems
v
© ISO/CIE 2014 – All rights reserved
---------------------- Page: 11 ----------------------
SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
 CIE 2013
This document is a CIE International Standard and is copyright-protected by CIE.

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced

or utilized in any form or by any means, electronic or mechanical, including photocopying and

microfilm, without permission in writing from CIE Central Bureau at the address below.

CIE Central Bureau
Babenbergerstraße 9/9A
A-100 Vienna
Austria
Tel.: +43 1 714 3187
e-mail: ciecb@cie.co.at
www.cie.co.at
vi © ISO/CIE 2014 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
Foreword

International Standards produced by the Commission Internationale de l’Eclairage are

concise documents on aspects of light and lighting that require a unique definition. They are

a primary source of internationally accepted and agreed data which can be taken, essentially

unaltered, into universal standard systems.

This CIE International Standard has been prepared by CIE Technical Committee TC 1-57*. It

has been approved by the Board of Administration and Division 1 "Vision and Colour" of the

Commission Internationale de l’Eclairage and the CIE National Committees.

The following ISO and IEC committees and working groups co-operated in the preparation of

this International Standard:
IEC TC100/TA2 (Audio, video and multimedia systems)
ISO TC6 (Paper, board and pulps)
ISO TC35/SC9/WG22 (Paints and varnishes)
ISO TC38/SC1/WG7 (Textiles)
ISO TC42 (Photography)
ISO TC130 (Graphic technology)
ISO/IEC/JTC1/SC28 (Office systems)

* The chairperson of this TC was A.R. Robertson (CA), members were: P.J. Alessi (US), M.

Brill (US), J. Campos Acosta (ES), E. Carter (US), R. Connelly (US), J.-F. Decarreau (FR), R.

Harold (US), R. Hirschler (HU), B. Jordan (CA) , C. Kim (KR), D. McDowell (US), P. McGinley

(AU), M. Melgosa (ES), Y. Ohno (US), M.R. Poin ter (GB), K. Richter (DE), G. Rösler † (DE),

J.D. Schanda (HU), R. Sève (FR), K. Witt (DE), H. Yaguchi (JP), J. Zwinkels (CA).

© ISO/CIE 2014 – All rights reserved vii
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SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
CONTENTS

Foreword ............................................................................................................................ vii

Introduction .......................................................................................................................... 1

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

2  Normative References .................................................................................................... 1

3  Definitions, Symbols and Abbreviations .......................................................................... 1

4  Reference Conditions ..................................................................................................... 3

5  Calculation Method ......................................................................................................... 3

6  Parametric Factors ......................................................................................................... 6

Annex A (Informative) Three-Component Micro-Spaces ......................................................... 7

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

viii © ISO/CIE 2014 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
Colorimetry – Part 6: CIEDE2000 Colour-Difference Formula
Introduction

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

...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kolorimetrija - 6. del: Formula barvne razlike CIEDE2000 (ISO/CIE 11664-6:2014)Farbmetrik - Teil 6: CIEDE2000 Formel für den Farbabstand (ISO/CIE 11664-6:2014)Colorimétrie - Partie 6: Formule d'écart de couleur CIEDE2000 ( ISO/CIE 11664-6:2014)Colorimetry - Part 6: CIEDE2000 Colour-difference formula (ISO/CIE 11664-6:2014)17.180.20Barve in merjenje svetlobeColours and measurement of lightICS:Ta slovenski standard je istoveten z:FprEN ISO 11664-6kSIST FprEN ISO 11664-6:2016en,fr,de01-april-2016kSIST FprEN ISO 11664-6:2016SLOVENSKI

STANDARD
kSIST FprEN ISO 11664-6:2016
oeference number fpliCfb NNpp4-ptl0N4bbc
© fpliCfb l0N4
fNTboNATflNAi pTANaAoa fpl/Cfb NNpp4-p

cirst edition l0N4-0l-0N Colorimetry — mart pt CfbablMMM Colour-difference formula Colorimétrie — Partie 6: Formule d'écart de couleur CIEDE2000

kSIST FprEN ISO 11664-6:2016
ISO/CIE 11664-6:2014(E)
COPYRIGHT PROTECTED DOCUMENT

ISO/CIE 2014 . ISO copyright office CIE Central Bureau Case postale 56 • CH-1211 Geneva 20 Babenbergerstraße 9/9A • A-1010 Vienna Tel.

+ 41 22 749 01 11 Tel.
+ 43 1 714 3187 Fax
+ 41 22 749 09 47
E-mail
copyright@iso.org E-mail
ciecb@cie.co.at Web
www.iso.org Web
www.cie.co.at
Published in Switzerland
ii © ISO/CIE 2014 – All rights reserved

All rights reserved. Unless otherwise specified, 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 or CIE at the respective addresses below. kSIST FprEN ISO 11664-6:2016

fpl/Cfb NNpp4-p:lMN4bbc © fpliCfb l0N4 – All rights reserved iii

coreword 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 on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL:

Foreword - Supplementary information fpliCfb NNpp4-p was prepared by Cfb Technical Committee TC N-oT of aivision N Vision and colour. as Cfb p 0N4-p. fpliCfb NNpp4 consists of the following partsf under the general title Colorimetryt — Part 1: CIE standard colorimetric observers — Part 2: CIE standard illuminants — Part 3: CIE tristimulus values — Part 4: CIE 1976 L*a*b* Colour space — Part 5: CIE 1976 L*u*v* Colour space and u', v' uniform chromaticity scale diagram — Part 6: CIEDE2000 Colour-difference formula

kSIST FprEN ISO 11664-6:2016
kSIST FprEN ISO 11664-6:2016
fpl/CfE 11pp4-p:l014EEc
Cfb p MN4-p/b:lMNm fnternational ptandard

wwColorimetry – mart p: CfbablMMM Colour-aifference cormulawColorimétriew–wmartiewétwcormulewdaécartwdewcouleurwCfbabljjjwcarbmessungw–wèeilwétwCfbabljjjgcarbabstandsformelwCfbwfnternationalwétandardswarewcoéyrightedwandwshallwnotwbewreéroducedwinwanywformfwentirelyworwéartlyfwwithoutwthewexélicitwagreementwofwthewCfbhwCfbwCentralwBureaufwsiennawwCfbwéwjk4géibtljkmwraCtwomohéotjjéwaescriétortwétandardisationwofwcolourwmeasurementwwomohé4mhlwwétandardwcolorimetricwsystemsw© fpliCfb l0N4 – All rights reserved Babenbergerstraße 9/9A • A-1010 ViennakSIST FprEN ISO 11664-6:2016

vi © fpliCfb ljk4 – All rights reserved

wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwCfbwljkmwèhiswdocumentwiswawCfbwfnternationalwétandardwandwiswcoéyrightgérotectedwbywCfbhwAllwrightswreservedhwrnlesswotherwisewséecifiedfwnowéartwofwthiswéublicationwmaywbewreéroducedworwutilizedwinwanywformworwbywanywmeansfwelectronicworwmechanicalfwincludingwéhotocoéyingwandwmicrofilmfwwithoutwéermissionwinwwritingwfromwCfbwCentralwBureauwatwthewaddresswbelowhwCfbwCentralwBureauwAgkjjwsiennawAustriawèelhtwe4mwkwèk4wmkrèwegmailtwciecbzciehcohatwwwwhciehcohatwfpl/Cfb NNpp4-p:lMN4bbc Babenbergerstraße 9/9AkSIST FprEN ISO 11664-6:2016

© fpliCfb ljk4 – All rights reserved vii

coreword èhiswCfbwfnternationalwétandardwhaswbeenwéreéaredwbywCfbwèechnicalwCommitteewèCwkgoèdhwftwhaswbeenwaéérovedwbywthewBoardwofwAdministrationwandwaivisionwkw"sisionwandwColour"wofwthewCommissionwfnternationalewdewl’bclairagewandwthewCfbwkationalwCommitteeshwèhewfollowingwfélwandwfbCwcommitteeswandwworkingwgrouéswcogoéeratedwinwthewéreéarationwofwthiswfnternationalwétandardtwwfbCwèCkjjièAlwbAudiofwvideowandwmultimediawsystemscwfélwèCéwbmaéerfwboardwandwéuléscwfélwèCmoiéCsitdllwbmaintswandwvarnishescwfélwèCmriéCkitdèwbèextilescwfélwèC4lwbmhotograéhycwfélwèCkmjwbdraéhicwtechnologycwfélifbCigèCkiéClrwblfficewsystemscwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwdwèhewchairéersonwofwthiswèCwwaswAhohwoobertsonwbCAcfwmemberswweretwmhghwAlessiwbrécfwjhwBrillwbrécfwghwCaméoswAcostawbbécfwbhwCarterwbrécfwohwConnellywbrécfwghgchwaecarreauwbcocfwohwearoldwbrécfwohweirschlerwbercfwBhwgordanwbCAcfwChwhimwbhocfwahwjcaowellwbrécfwmhwjcdinleywbArcfwjhwjelgosawbbécfwvhwlhnowbrécfwjhohwmointerwbdBcfwhhwoichterwbabcfwdhwoöslerw†wbabcfwghahwéchandawbercfwohwéèvewbcocfwhhwtittwbabcfwehwvaguchiwbgmcfwghwwwinkelswbCAchwfnternational ptandards produced by the Commission fnternationale de l’bclairage are concise documents on aspects of light and lighting that require a unique definition. qhey are a primary source of internationally accepted and agreed data which can be takenf essentially unalteredf into universal standard systems. fpl/CfE 11pp4-p:l014EEc kSIST FprEN ISO 11664-6:2016

fpl/CfE 11pp4-p:l014EEc viii © fpliCfb ljk4 – All rights reserved
ClNTbNTp

corewordwhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwvii fntroductionwhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwk k écoéewhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwk l kormativewoeferenceswhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwk m aefinitionsfwéymbolswandwAbbreviationswhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwk 4 oeferencewConditionswhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwm o Calculationwjethodwhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwm é marametricwcactorswhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwé AnnexwAwbfnformativecwèhreegComéonentwjicrogééaceswhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwè Bibliograéhywhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwr

kSIST FprEN ISO 11664-6:2016
© fpliCfb ljk4 – All rights reserved 1

Colorimetry – mart p: CfbablMMM Colour-aifference cormula fntroduction Cfbwk4lgljjkhwImprovement to industrial colour-difference evaluationfwljjkhwCfbwéwjkèibtljkkhwILV:wInternational Lighting Vocabularyfwljkk.wfélwkkéé4g4tljjrbbciCfbwéwjk4g4ibtljjèhwgointwféliCfbwétandardtwColorimetry – Part 4: 1976 L*a*b* Colour Spacefwljjrhwm aefinitionsf pymbols and Abbreviations corwthewéuréoseswofwthiswfnternationalwétandardfwthewtermswandwdefinitionswgivenwinwCfbwéwjkèibtljkkwbfnternationalwiightingwsocabularycfwandwthewfollowingwsymbolswandwabbreviationswaéélyhwqhe three-dimensional colour space produced by plotting Cfb tristimulus values bXf Yf Zc in rectangular coordinates is not visually uniformf nor is the bxf yf Yc space nor the two-dimensional Cfb bxf yc chromaticity diagram. bqual distances in these spaces and diagrams do not represent equally perceptible differences between colour stimuli. cor this reason the Cfb has standardized two more-nearly uniform colour spaces bknown as CfbiAB and Cfbirsc whose coordinates are non-linear functions of Xf Y and Z. kumerical values representing approximately the relative magnitude of colour differences can be described by simple buclidean distances in these spaces or by more sophisticated colour-difference formulae that improve the correlation with the relative perceived size of differences. qhe purpose of this Cfb fnternational ptandard is to define one such formulaf the Cfbabl000 formula. qhe ptandard is based on Cfb qechnical oeport k4l-l00k. qhe formula is an extension of the Cfb ksqp L*a*b* colour-difference formula bfpl kkpp4-4:l00rbbciCfb p 0k4-4ib:l00qc with corrections for variation in colour-difference perception dependent on lightnessf chromaf hue and chroma-hue interaction. oeference conditions define material and viewing environment characteristics to which the formula applies. N pcope qhis Cfb fnternational ptandard specifies the method of calculating colour differences according to the Cfbabl000 formula.

qhe ptandard is applicable to input values of CfbiAB L*f a*f b* coordinates calculated according to fpl kkpp4-4:l00rbbciCfb p 0k4-4ib:l00q. qhe ptandard may be used for the specification of

...

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