SIST EN ISO 11664-4:2011
(Main)Colorimetry - Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4:2008)
Colorimetry - Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4:2008)
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.
Farbmetrik - Teil 4: CIE 1976 L*a*b* Farbenraum (ISO 11664-4:2008)
Diese Internationale Norm 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 Farb-abstände entsprechen.
Diese Norm gilt für Farbwerte, die nach den Spektralwertfunktionen des Normvalenzsystems CIE 1931 oder des Normvalenzsystems CIE 1964 berechnet sind. Diese Norm kann angewendet werden für die Festlegung von Farbreizen, die als zu einem reflektierenden oder transmittierend Objekt zugehörig empfunden wurden, wenn ein dreidimensionaler Farbenraum, der gleichabständiger ist als der Farbenraum der Farbwerte, benötigt wird. Sie 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. Diese Norm gilt auch nicht 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.
Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE 1976 (ISO 11664-4:2008)
L'ISO 11664-4:2008 sp�cifie la m�thode de calcul des coordonn�es de l'espace chromatique L*a*b* CIE 1976 ainsi que des correspondants de clart�, de chroma et de teinte. Elle donne deux m�thodes de calcul de la distance euclidienne dans cet espace, repr�sentant la valeur per�ue des diff�rences de couleur.
L'ISO 11664-4:2008 est applicable aux composantes trichromatiques calcul�es en utilisant les fonctions colorim�triques du syst�me colorim�trique CIE 1931 normalis� ou du syst�me colorim�trique CIE 1964 normalis�. Elle peut �tre utilis�e pour la sp�cification de stimulus de couleur se rapportant � des objets qui r�fl�chissent ou qui transmettent la lumi�re, pour lesquels un espace chromatique tridimensionnel plus uniforme que le syst�me trichromatique est n�cessaire. Elle ne s'applique pas � des stimulus de couleur se rapportant � des surfaces qui paraissent �mettre de la lumi�re comme le font les sources primaires de lumi�re ou qui apparaissent r�fl�chir sp�culairement de telles lumi�res. L'ISO 11664-4:2008 s'applique aux afficheurs auto-lumineux, tels que des tubes cathodiques, quand ils sont utilis�s pour simuler des objets r�fl�chissants ou transparents, � condition que les stimulus soient convenablement normalis�s.
Kolorimetrija - 4. del: CIE 1976 L*a*b* barvni prostor (ISO 11664-4:2008)
ISO 11664-4:2008 določa metodo za izračun koordinat barvnega prostora CIE 1976 L*a*b*, vključno s korelati svetlosti, kromatičnosti in barve. Vključuje dve metodi za izračun evklidskih razdalj v tem prostoru, ki predstavljajo zaznan obseg razlik v barvah.
ISO 11664-4:2008 velja za vrednosti tristimulusa, ki se izračunajo z uporabo funkcije barvnega usklajevanja kolorimetričnega sistema po standardu CIE 1931 ali kolorimetričnega sistema po standardu CIE 1964. ISO 11664-4:2008 se lahko uporablja za specifikacijo barvnih dražljajev, ki se zaznajo kot del refleksijskega ali transmisijskega objekta, pri katerem je potreben trodimenzionalni prostor, enotnejši od tristimulusnega prostora. Ne velja za barvne dražljaje, ki se zaznajo kot del območja, ki na prvi pogled oddaja svetlobo kot primarni vir svetlobe ali ki na prvi pogled tako svetlobo zrcalno odbija. ISO 11664-4:2008 velja za samosvetleče zaslone, kot so zasloni s katodnimi cevmi, če se uporabljajo kot simulacija refleksijskih ali transmisijskih objektov in če se dražljaji ustrezno normalizirajo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11664-4:2011
01-julij-2011
Kolorimetrija - 4. del: CIE 1976 L*a*b* barvni prostor (ISO 11664-4:2008)
Colorimetry - Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4:2008)
Farbmetrik - Teil 4: CIE 1976 L*a*b* Farbenraum (ISO 11664-4:2008)
Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE 1976 (ISO 11664-4:2008)
Ta slovenski standard je istoveten z: EN ISO 11664-4:2011
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
SIST EN ISO 11664-4:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 11664-4:2011
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SIST EN ISO 11664-4:2011
EUROPEAN STANDARD
EN ISO 11664-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2011
ICS 17.180.20
English Version
Colorimetry - Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-
4:2008)
Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE Farbmetrik - Teil 4: CIE 1976 L*a*b* Farbenraum (ISO
1976 (ISO 11664-4:2008) 11664-4:2008)
This European Standard was approved by CEN on 17 March 2011.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11664-4:2011: E
worldwide for CEN national Members.
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SIST EN ISO 11664-4:2011
EN ISO 11664-4:2011 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 11664-4:2011
EN ISO 11664-4:2011 (E)
Foreword
The text of ISO 11664-4:2008 has been prepared by Technical Committee CIE “International Commission on
Illumination” of the International Organization for Standardization (ISO) and has been taken over as
EN ISO 11664-4:2011 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 October 2011, and conflicting national standards shall be withdrawn at
the latest by October 2011.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 11664-4:2008 has been approved by CEN as a EN ISO 11664-4:2011 without any
modification.
3
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SIST EN ISO 11664-4:2011
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SIST EN ISO 11664-4:2011
INTERNATIONAL ISO
STANDARD 11664-4
CIE S 014-4/E
First edition
2008-11-01
Colorimetry —
Part 4:
CIE 1976 L*a*b* Colour space
Colorimétrie —
Partie 4: Espace chromatique L*a*b* CIE 1976
Reference number
ISO 11664-4:2008(E)
CIE S 014-4/E:2007
©
ISO 2008
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(E)
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© ISO 2008
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 either ISO at the address below or
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Published in Switzerland
ii © ISO 2008 — All rights reserved
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(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.
ISO 11664-4 was prepared as Standard CIE S 014-4/E by the International Commission on Illumination, which
has been recognized by the ISO Council as an international standardizing body. It was adopted by ISO under
a special procedure which requires approval by at least 75 % of the member bodes casting a vote, and is
published as a joint ISO/CIE edition.
The International Commission on Illumination (abbreviated as CIE from its French title) is an organization
devoted to international cooperation and exchange of information among its member countries on all matters
relating to the science and art of lighting.
ISO 11664-4 was prepared by CIE Technical Committee 1-57 of Division 1, Vision and colour.
ISO 11664 consists of the following parts, under the general title Colorimetry:
— Part 1: CIE standard colorimetric observers
— Part 2: CIE standard illuminants
— Part 4: CIE 1976 L*a*b* Colour space
© ISO 2008 — All rights reserved iii
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SIST EN ISO 11664-4:2011
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(E)
CIE S 014-4/E:2007
CIE S 014-4/E:2007
Standard
Colorimetry -
Part 4: CIE 1976 L*a*b* Colour
Space
Colorimétrie - Partie 4: Espace chromatique L*a*b* CIE 1976
Farbmessung - Teil 4: CIE 1976 L*a*b* Farbenraum
CIE 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 014-4/E:2007
Kegelgasse 27, A-1030 Vienna, Austria
UDC: 535.65:006 Descriptor: Standardisation of colour measurement
535.643.2 Standard colorimetric systems
© CIE 2007 — All rights reserved
© ISO 2008 — All rights reserved v
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(E)
CIE S 014-4/E:2007
© CIE, 2007
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
Kegelgasse 27
A-1030 Vienna
Austria
Tel.: +43 1 714 3187 0
Fax: +43 1 714 3187 18
e-mail: ciecb@cie.co.at
Web: www.cie.co.at
© CIE 2007 — All rights reserved
vi © ISO 2008 — All rights reserved
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(E)
CIE S 014-4/E:2007
FOREWORD
Standards produced by the Commission Internationale de l’Eclairage (CIE) are a concise
documentation of data defining aspects of light and lighting, for which international harmony
requires such unique definition. CIE Standards are therefore a primary source of
internationally accepted and agreed data, which can be taken, essentially unaltered, into
universal standard systems.
This CIE Standard has been prepared by the Technical Committee TC 1-57* of
Division 1 "Vision and Colour" and was approved by the National Committees of the CIE.
The following ISO and IEC committees and working groups co-operated in the
preparation of this standard:
IEC TC100/TA2 (Audio, Video and Multimedia Systems)
ISO TC6 (Paper, Board and Pulps)
ISO TC35/SC9/WG22 (Paint 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), J.A.
Bristow (SE), J. Campos Acosta (ES), R. Connelly (US), J.-F. Decarreau (FR), R. Harold
(US), R. Hirschler (HU), H. Ikeda (JP), B. Jordan (CA), C. Kim (KR), D. McDowell (US), P.
McGinley (AU), Y. Ohno (US), M.R. Pointer (GB), K. Richter (DE), G. Rösler (DE), J.D.
Schanda (HU), R. Sève (FR), K. Smith (GB), K. Witt (DE), H. Yaguchi (JP), J. Zwinkels (CA).
© CIE 2007 — All rights reserved
© ISO 2008 — All rights reserved vii
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(E)
CIE S 014-4/E:2007
TABLE OF CONTENTS
FOREWORD vii
INTRODUCTION 1
1. SCOPE 1
2. NORMATIVE REFERENCES 1
3. DEFINITIONS, SYMBOLS AND ABBREVIATIONS 1
4. CALCULATION METHOD 2
4.1 Basic coordinates 2
4.2 Correlates of lightness, chroma and hue 3
4.3 Colour differences 4
ANNEX (INFORMATIVE): REVERSE TRANSFORMATION 6
BIBLIOGRAPHY 7
© CIE 2007 — All rights reserved
viii © ISO 2008 — All rights reserved
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SIST EN ISO 11664-4:2011
ISO 11664-4:2008(E)
CIE S 014-4/E:2007
COLORIMETRY - PART 4: CIE 1976 L*a*b* COLOUR SPACE
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 non-linear functions of X, Y and Z. The recommendation was put forward in
an attempt to unify the then very diverse practice in uniform colour spaces and associated
colour difference formulae (Robertson, 1990; CIE, 2004). 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 CIE Standard 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. The standard does not cover
more sophisticated colour difference formulae based on CIELAB, such as the CMC formula
(Clarke et al., 1984), the CIE94 formula (CIE, 1995), the DIN99 formula (DIN, 2001), and the
CIEDE2000 formula (CIE, 2001), nor does it cover the alternative uniform colour space,
CIELUV.
1. SCOPE
This CIE Standard 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.
The Standard is applicable to tristimulus values calculated using colour-matching
functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric
system. The Standard 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. This Standard does apply to self-luminous
displays, like cathode ray t
...
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