oSIST prEN ISO/CIE 11664-5:2023

Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u', v' uniform chromaticity scale diagram (ISO/CIE DIS 11664-5:2023)

ISO/CIE 11664-5:2016 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.
ISO/CIE 11664-5:2016 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 part of ISO/CIE 11664 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. This includes 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. This part of ISO/CIE 11664, 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 DIS 11664-5:2023)

Colorimétrie — Partie 5: Espace chromatique L*u*v* et diagramme de chromaticité uniforme u', v' CIE 1976 (ISO/CIE DIS 11664-5:2023)

ISO/CIE 11664-5:2016 fixe la méthode de calcul des coordonnées de l'espace chromatique L*u*v* CIE 1976 ainsi que des correspondants de clarté, de chroma, de saturation et de teinte. Elle comprend deux méthodes de calcul de la distance euclidienne dans cet espace, représentant la valeur perçue des différences de couleur. Elle spécifie également la méthode de calcul des coordonnées u′,v′ du diagramme de chromaticité uniforme.
ISO/CIE 11664-5:2016 est applicable aux composantes trichromatiques calculées en utilisant les fonctions colorimétriques du système colorimétrique normalisé CIE 1931 ou du système colorimétrique normalisé CIE 1964. La présente partie de l'ISO/CIE 11664 peut être utilisée 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. Ceci comprend les afficheurs auto-lumineux, tels que les tubes cathodiques, quand ils sont utilisés pour simuler des objets qui réfléchissent ou transmettent la lumière, si les stimulus sont convenablement normalisés. La présente partie de l'ISO/CIE 11664, dans son ensemble, 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. Seuls s'appliquent à de tels stimulus le diagramme de chromaticité uniforme u′,v′ défini en 4.1 et les correspondants de teinte et de saturation définis en 4.3.

Kolorimetrija - 5. del: Barvni prostor L*u*v* in diagram enakomerne barvnosti u', v' po CIE 1976 (ISO/CIE DIS 11664-5:2023)

General Information

• Status: Not Published
• Public Enquiry End Date: 02-Jun-2023
• ICS: 17.180.20 - Colours and measurement of light
• Technical Committee: IBLP - Paints and varnishes
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 06-Apr-2023
• Due Date: 24-Aug-2023
• Completion Date: 06-Jun-2023
• Ref Project: prEN ISO/CIE 11664-5 - Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u', v' uniform chromaticity scale diagram (ISO/CIE DIS 11664-5:2023)

Relations

• Revises: SIST EN ISO 11664-5:2016 - Colorimetry - Part 5: CIE 1976 L*u*v* Colour space and u', v' uniform chromaticity scale diagram (ISO/CIE 11664-5:2016)
• Effective Date: 01-May-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO/CIE 11664-5:2023
01-maj-2023
Kolorimetrija - 5. del: Barvni prostor L*u*v* in diagram enakomerne barvnosti u', v'
po CIE 1976 (ISO/CIE DIS 11664-5:2023)
Colorimetry - Part 5: CIE 1976 L*u*v* colour space and u', v' uniform chromaticity scale
diagram (ISO/CIE DIS 11664-5:2023)
Farbmetrik - Teil 5: CIE 1976 L*u*v*-Farbenraum und gleichabständige u', v'-Farbtafel
(ISO/CIE DIS 11664-5:2023)
Colorimétrie Partie 5: Espace chromatique L*u*v* et diagramme de chromaticité
uniforme u', v' CIE 1976 (ISO/CIE DIS 11664-5:2023)
Ta slovenski standard je istoveten z: prEN ISO/CIE 11664-5
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
oSIST prEN ISO/CIE 11664-5:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO/CIE 11664-5:2023

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oSIST prEN ISO/CIE 11664-5:2023
DRAFT INTERNATIONAL STANDARD
ISO/CIE DIS 11664-5
CIE Secretariat: CIE
Voting begins on: Voting terminates on:
2023-04-04 2023-06-27
Colorimetry —
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
ICS: 17.180.20
Member bodies are requested to consult relevant national interests in ISO/TC
274 before casting their ballot to the e-Balloting application.
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/CIE DIS 11664-5:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO/CIE 2023

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oSIST prEN ISO/CIE 11664-5:2023
ISO/CIE DIS 11664-5:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/CIE DIS 11664-5
CIE Secretariat: CIE
Voting begins on: Voting terminates on:

Colorimetry —
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
ICS: 17.180.20
Member bodies are requested to consult relevant national interests in ISO/TC
274 before casting their ballot to the e-Balloting application.
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
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FOR COMMENT AND APPROVAL. IT IS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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THEREFORE SUBJECT TO CHANGE AND MAY
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org Website: www.cie.co.at ISO/CIE DIS 11664-5:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
  © ISO/CIE 2023 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO/CIE 2023

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oSIST prEN ISO/CIE 11664-5:2023
ISO/CIE DIS 11664-5:2023(E)
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
iii
© ISO/CIE 2023 – All rights reserved

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oSIST prEN ISO/CIE 11664-5:2023
ISO/CIE DIS 11664-5:2023(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.
The committee responsible for this document is ISO/TC 274, Light and lighting.
This second edition cancels and replaces the first edition (ISO 11664-5:2009), of which it constitutes a
minor revision.
ISO 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: CIE-DE2000 Colour-difference formula
iv
  © ISO/CIE 2023 – All rights reserved

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oSIST prEN ISO/CIE 11664-5:2023
ISO/CIE DIS 11664-5:2023(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 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
[2][8]
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 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 part of ISO/CIE 11664 is to define 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 part of ISO/CIE 11664 also defines a related chromaticity diagram
that is a projection of the CIE x,y chromaticity diagram maintaining straight lines of dominant and
complementary wavelengths. This part of ISO/CIE 11664 does not cover the alternative uniform colour
[5]
space, CIELAB , nor does it cover more sophisticated colour difference formulae based on CIELAB,
[3] [1] [4] [6]
such as the CMC formula , the CIE 94 formula , the DIN 99 formula , and the CIEDE2000 formula .
v
© ISO/CIE 2023 – All rights reserved

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oSIST prEN ISO/CIE 11664-5:2023

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oSIST prEN ISO/CIE 11664-5:2023
DRAFT INTERNATIONAL STANDARD ISO/CIE DIS 11664-5:2023(E)
Colorimetry —
Part 5:
CIE 1976 L*u*v* colour space and u', v' uniform
chromaticity scale diagram
1 Scope
This part of ISO/CIE 11664 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 part of ISO/CIE 11664 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 part of ISO/CIE 11664 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. 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 part of ISO/CIE 11664, 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.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observer
...