EN ISO/CIE 11664-5:2024
(Main)Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u', v' uniform chromaticity scale diagram (ISO/CIE 11664-5:2024)
Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u', v' uniform chromaticity scale diagram (ISO/CIE 11664-5:2024)
This document specifies the method of calculating the coordinates of the CIE 1976 L*u*v* colour space including correlates of lightness, chroma, saturation and hue. It includes two methods for calculating Euclidean distances in this space to represent the relative perceived magnitude of colour differences. It also specifies the method of calculating the coordinates of the u′,v′ uniform chromaticity scale diagram.
This document is applicable to tristimulus values calculated using the colour-matching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. This document is applicable 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 includes self-luminous displays, like computer, television and smart-phone displays, if they are being used to simulate reflecting or transmitting objects and if the stimuli are appropriately normalized.
This document, as a whole, 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. Only the u′,v′ uniform chromaticity scale diagram defined in 4.1 and the correlates of hue and saturation defined in 4.3 apply to such colour stimuli.
Farbmetrik - Teil 5: CIE 1976 L*u*v*-Farbenraum und gleichabständige u', v'‑Farbtafel (ISO/CIE 11664-5:2024)
Dieses Dokument legt das Verfahren zum Berechnen der Koordinaten des CIE 1976 L*u*v* Farbenraums fest, einschließlich Zuordnungen für Helligkeit, Buntheit, Sättigung und Buntton. Es enthält zwei Verfahren zum Berechnen euklidischer Abstände in diesem Farbenraum, um die relative empfindungsgemäße Größe von Farbabständen darzustellen. Außerdem legt es das Verfahren zum Berechnen der Koordinaten der gleichabständigen u',v' Farbtafel fest.
Dieses Dokument ist auf Farbwerte anwendbar, die nach den Spektralwertfunktionen des Normvalenzsystems CIE 1931 oder des Normvalenzsystems CIE 1964 berechnet wurden. Dieses Dokument ist für die Festlegung von Farbreizen anwendbar, die als zu einem reflektierenden oder transmittierenden Objekt zugehörig empfunden werden, wenn ein dreidimensionaler Farbenraum erforderlich ist, der gleichabständiger ist als der Farbenraum der Farbwerte. Dies schließt selbstleuchtende Displays, wie Computer , Fernseh- und Smartphone-Bildschirme ein, wenn sie dazu verwendet werden, reflektierende oder transmittierende Objekte zu simulieren, und wenn die Farbreize in geeigneter Weise normiert sind.
Dieses Dokument als Ganzes ist nicht auf Farbreize anwendbar, die als zu einer Fläche zugehörig empfunden werden, welche Licht als eine primäre Lichtquelle zu emittieren oder solches Licht gerichtet zu reflektieren scheint. Nur die in 4.1 definierte gleichabständige u',v‘ Farbtafel und die in 4.3 definierten Zuordnungen von Buntton und Sättigung gelten für solche Farbreize.
Colorimétrie - Partie 5: Espace chromatique L*u*v* et diagramme de chromaticité uniforme u’, v’ CIE 1976 (ISO/CIE 11664-5:2024)
Le présent document spécifie la méthode de calcul des coordonnées de l’espace chromatique CIE 1976 L*u*v*, et des corrélats de clarté, chroma, saturation et teinte. Elle comprend deux méthodes permettant de calculer les distances euclidiennes dans cet espace, pour représenter l’amplitude relative perçue des différences de couleurs. Elle spécifie également la méthode de calcul des coordonnées du diagramme de chromaticité uniforme u’,v’.
Le présent document s’applique aux composantes trichromatiques calculées à l’aide des fonctions d’égalisation de couleur du système de référence colorimétrique CIE 1931 ou du système de référence colorimétrique CIE 1964. Le présent document est applicable dans la spécification de stimuli de couleurs perçus comme appartenant à un objet transparent, translucide ou réfléchissant, lorsqu’un espace tridimensionnel plus uniforme que l’espace des composantes trichromatiques est requis. Sont inclus certains écrans d’affichage lumineux par eux-mêmes, tels que les écrans d’ordinateur, de télévision et de téléphones portables, s’ils sont utilisés pour simuler des objets transparents, translucides ou réfléchissants et si les stimuli sont normalisés de manière appropriée.
Le présent document, dans son ensemble, n’est pas applicable aux stimuli de couleurs perçus comme appartenant à une surface qui semble émettre de la lumière comme une source primaire de lumière ou réfléchir spéculairement une telle lumière. Seul le diagramme de chromaticité uniforme u′,v′ défini en 4.1 et les notions corrélatives de teinte et de saturation définies en 4.3 s’appliquent à de tels stimuli de couleurs.
Kolorimetrija - 5. del: Barvni prostor L*u*v* in diagram enakomerne barvnosti u', v' po CIE 1976 (ISO/CIE 11664-5:2024)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN ISO 11664-5:2016
Kolorimetrija - 5. del: Barvni prostor L*u*v* in diagram enakomerne barvnosti u', v'
po CIE 1976 (ISO/CIE 11664-5:2024)
Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u', v' uniform chromaticity scale
diagram (ISO/CIE 11664-5:2024)
Farbmetrik - Teil 5: CIE 1976 L*u*v*-Farbenraum und gleichabständige u', v'‑Farbtafel
(ISO/CIE 11664-5:2024)
Colorimétrie - Partie 5: Espace chromatique L*u*v* et diagramme de chromaticité
uniforme u’, v’ CIE 1976 (ISO/CIE 11664-5:2024)
Ta slovenski standard je istoveten z: EN ISO/CIE 11664-5:2024
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO/CIE 11664-5
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2024
EUROPÄISCHE NORM
ICS 17.180.20 Supersedes EN ISO 11664-5:2016
English Version
Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u',
v' uniform chromaticity scale diagram (ISO/CIE 11664-
5:2024)
Colorimétrie - Partie 5: Espace chromatique L*u*v* et Farbmetrik - Teil 5: CIE 1976 L*u*v*-Farbenraum und
diagramme de chromaticité uniforme u', v' CIE 1976 gleichabständige u', v'-Farbtafel (ISO/CIE 11664-
(ISO/CIE 11664-5:2024) 5:2024)
This European Standard was approved by CEN on 29 May 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/CIE 11664-5:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO/CIE 11664-5:2024) has been prepared by Technical Committee ISO/TC 274
"Light and lighting" 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 December 2024, and conflicting national standards
shall be withdrawn at the latest by December 2024.
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 11664-5:2016.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO/CIE 11664-5:2024 has been approved by CEN as EN ISO/CIE 11664-5:2024 without any
modification.
International
Standard
ISO/CIE 11664-5
Second edition
Colorimetry —
2024-06
Part 5:
CIE 1976 L*u*v* colour space and u',
v' uniform chromaticity scale diagram
Colorimétrie —
Partie 5: Espace chromatique L*u*v* et diagramme de
chromaticité uniforme u’, v’ CIE 1976
Reference number
ISO/CIE 11664-5:2024(en) © ISO/CIE 2024
ISO/CIE 11664-5:2024(en)
© ISO/CIE 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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© ISO/CIE 2024 – All rights reserved
ii
ISO/CIE 11664-5:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
3.1 Terms and definitions .1
3.2 Symbols and abbreviated terms .2
4 Calculation method . 2
4.1 Uniform chromaticity scale diagram (UCS diagram) .2
4.2 Uniform colour space .3
4.3 Correlates of lightness, saturation, chroma and hue .4
4.4 Colour differences .5
Annex A (informative) Reverse transformation . 7
Bibliography . 8
© ISO/CIE 2024 – All rights reserved
iii
ISO/CIE 11664-5:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO/CIE 11664-5:2016), which has been technically
revised.
The main changes are as follows:
— list of ISO/CIE 11664 series Colorimetry shifted from Foreword to Introduction;
— text in 3.1, 4.2, 4.3, and 4.4 updated;
— previous Formula (24) deleted and related formula numbers updated accordingly;
— sign in Formula (26) updated;
— Bibliography updated;
— minor editorial changes.
A list of all parts in the 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.
© ISO/CIE 2024 – All rights reserved
iv
ISO/CIE 11664-5:2024(en)
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 and diagrams 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
[2][8]
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 relative 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 relative perceived size of differences.
The purpose of this document is to specify procedures for calculating the coordinates of the CIE 1976 L*u*v*
(CIELUV) colour space and the Euclidean colour difference values based on these coordinates. This document
also specifies a related chromaticity diagram that is a projection of the CIE x,y chromaticity diagram
maintaining straight lines of dominant and complementary wavelengths. It does not cover the alternative
[5]
uniform colour space, CIELAB, nor does it cover more sophisticated colour difference formulae based
[3] [1] [4]
on CIELAB, such as the CMC formula, the CIE 94 formula, the DIN 99 formula, and the CIEDE2000
[6]
formula .
The ISO/CIE 11664 series consists of the following parts, under the general title Colorimetry:
— Part 1: CIE standard colorimetric observers
— Part 2: CIE standard illuminants
— Part 3: CIE tri
...
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