Multimedia systems and equipment - Colour measurement and management - Part 2-4: Colour management - Extended-gamut YCC colour space for video applications - xvYCC

is applicable to the encoding and communication of YCC colours used in video systems and similar applications by defining encoding transformations for use in defined reference capturing conditions. If actual conditions differ from the reference conditions, additional rendering transformations may be required. Such additional rendering transformations are beyond the scope of this standard. The contents of the corrigendum of November 2006 have been included in this copy.

Multimediasysteme und -geräte – Farbmessung und Farbmanagement - Teil 2-4: Farbmanagement - Erweiterter YCC-Farbraum für Videoanwendungen - xvYCC

Mesure et gestion de la couleur dans les systèmes et appareils multimedia - Partie 2-4: Gestion de la couleur - Extension de gamme de l'espace chromatique YCC pour applications vidéo - xvYCC

La CEI 61966-2-4:2006 est applicable au codage et à la communication des couleurs YCC utilisées dans des systèmes vidéo et applications analogues en définissant les transformations de codage utilisées dans des conditions de capture définies. Si les conditions réelles diffèrent des conditions de référence, les transformations de rendu complémentaires peuvent être nécessaires. De telles transformations de rendu complémentaires se situent au delà du domaine d'application de cette norme. La présente version bilingue (2013-02) correspond à la version anglaise monolingue publiée en 2006-01.

Večpredstavnostni sistemi in oprema - Meritve in upravljanje barv - 2-4. del: Upravljanje barv - Razširjena lestvica v YCC barvnem prostoru za video aplikacije - xvYCC (IEC 61966-2-4:2006)

Ta del standarda IEC 61966 se uporablja za kodiranje in komunikacijo barv YCC, ki se uporabljajo v video sistemih in podobnih aplikacijah z določanjem kodirnih pretvorb za uporabo v opredeljenih referenčnih pogojih. Če se dejanski pogoji razlikujejo od referenčnih pogojev, so morda potrebne dodatne upodobitvene pretvorbe. Takšne dodatne upodobitvene pretvorbe so zunaj področja uporabe tega standarda.

General Information

Status
Published
Publication Date
14-Sep-2006
Current Stage
6060 - Document made available
Start Date
15-Sep-2006
Completion Date
15-Sep-2006

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---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 61966-2-4
NORME EUROPÉENNE
September 2006
EUROPÄISCHE NORM
ICS 33.160.40
English version
Multimedia systems and equipment -
Colour measurement and management
Part 2-4: Colour management -
Extended-gamut YCC colour space for video applications -
xvYCC
(IEC 61966-2-4:2006)
Mesure et gestion de la couleur Multimediasysteme und -geräte -
dans les systèmes et appareils multimedia Farbmessung und Farbmanagement
Partie 2-4 : Gestion de la couleur - Teil 2-4: Farbmanagement -
Extension de gamme de l'espace Erweiterter YCC-Farbraum
chromatique YCC pour für Videoanwendungen -
applications vidéo - xvYCC
xvYCC (IEC 61966-2-4:2006)
(CEI 61966-2-4:2006)

This European Standard was approved by CENELEC on 2006-09-01. CENELEC 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 Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and German). A version in any other language

made by translation under the responsibility of a CENELEC member into its own language and notified to the

Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61966-2-4:2006 E
---------------------- Page: 2 ----------------------
EN 61966-2-4:2006 - 2 -
Foreword

The text of the International Standard IEC 61966-2-4:2006, prepared by IEC TC 100, Audio, video and

multimedia systems and equipment, was submitted to the formal vote and was approved by CENELEC as

EN 61966-2-4 on 2006-09-01 without any modification.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-09-01
__________
Endorsement notice

The text of the International Standard IEC 61966-2-4:2006 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 61966-2-1 NOTE Harmonized as EN 61966-2-1:2000 + A1:2003 (not modified).
+ A1
IEC 61966-2-2 NOTE Harmonized as EN 61966-2-2:2003 (not modified).
__________
---------------------- Page: 3 ----------------------
- 3 - EN 61966-2-4:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60050-845 1987 International Electrotechnical Vocabulary -
(IEV)
Chapter 845: Lighting
ITU-R 1995 Studio encoding parameters of digital -
Recommendation television for standard 4:3 and
BT.601-5 wide-screen 16:9 aspect ratios
ITU-R 2002 Parameter values for the HDTV standards -
Recommendation for production and international
BT.709-5 programme exchange
---------------------- Page: 4 ----------------------
INTERNATIONAL IEC
STANDARD 61966-2-4
First edition
2006-01
Multimedia systems and equipment –
Colour measurement and management –
Part 2-4:
Colour management –
Extended-gamut YCC colour space
for video applications – xvYCC
 IEC 2006  Copyright - all rights reserved

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 the publisher.

International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland

Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

PRICE CODE
Commission Electrotechnique Internationale R
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
---------------------- Page: 5 ----------------------
– 2 – 61966-2-4  IEC:2006(E)
CONTENTS

FOREWORD...........................................................................................................................3

INTRODUCTION.....................................................................................................................5

1 Scope...............................................................................................................................6

2 Normative references .......................................................................................................6

3 Terms and definitions.........................................................................................................6

4 Colorimetric parameters and related characteristics .........................................................7

4.1 Primary colours and reference white........................................................................7

4.2 Opto-electronic transfer characteristics ...................................................................7

4.3 YCC (luma-chroma-chroma) encoding methods.......................................................8

4.4 Digital quantization methods ...................................................................................8

5 Encoding transformations .................................................................................................9

5.1 Introduction .............................................................................................................9

5.2 Transformation from xvYCC values to CIE 1931 XYZ values ...................................9

5.3 Transformation from CIE 1931 XYZ values to xvYCC values .................................11

Annex A (informative) Compression of specular components of Y’ signals ...........................13

Annex B (informative) Default transformation from 16-bit scRGB values to xvYCC values....14

Annex C (informative) xvYCC/ITU-R BT.709 and sYCC/sRGB compatibility .........................16

Bibliography..........................................................................................................................18

Figure A.1 – Example of the specular compression method ..................................................13

Figure C.1 – Relationship between ITU-R BT.709 and sRGB ................................................16

Figure C.2 – Relationship between xvYCC and sYCC ...........................................................17

Table 1 – CIE chromaticities for reference primary colours and reference white......................7

---------------------- Page: 6 ----------------------
61966-2-4  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –
Part 2-4: Colour management –
Extended-gamut YCC colour space
for video applications – xvYCC
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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

International Standard IEC 61966-2-4 has been prepared by IEC technical committee 100:

Audio, video and multimedia systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/967/CDV 100/1026/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 7 ----------------------
– 4 – 61966-2-4  IEC:2006(E)

IEC 61966 consists of the following parts, under the general title Multimedia systems and

equipment – Colour measurement and management:
Part 2-1: Colour management – Default RGB colour space – sRGB
Part 2-2: Colour management – Extended RGB colour space – scRGB

Part 2-4: Colour management – Extended-gamut YCC colour space for video applications –

xvYCC

Part 2-5: Colour management – Optional RGB colour space – opRGB (under consideration)

Part 3: Equipment using cathode ray tubes
Part 4: Equipment using liquid crystal display panels
Part 5: Equipment using plasma display panels
Part 6: Front projection displays
Part 7-1: Colour printers – Reflective prints – RGB inputs

Part 7-2: Colour printers – Reflective prints – CMYK inputs (proposed work item)

Part 8: Multimedia colour scanners
Part 9: Digital cameras
Part 10: Quality assessment (proposed work item)

Part 11: Quality assessment – Impaired video in network systems (proposed work item)

The committee has decided that the contents of this publication will remain unchanged until

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

the data related to the specific publication. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 8 ----------------------
61966-2-4  IEC:2006(E) – 5 –
INTRODUCTION

After the publication of IEC 61966-2-1, Amendment 1, the sYCC colour encoding was used to

capture, store and print extended colour gamut for still image applications. Users received

pleasant benefit by exchanging and reproducing wide-gamut colour images.

Recently, various kinds of displays that are capable of producing a wider gamut of colour than

the conventional CRT-based displays are emerging. However, most of the current video

contents that are displayed on conventional displays, are rendered for the sRGB-gamut.

Users of wide-gamut displays could benefit from wide-gamut colour images by video colour

encoding that supports a larger colour gamut.

This standard defines the “extended-gamut YCC colour space for video applications”. It is

based on the current implementation of YCC colour encoding that is used in the video industry

(namely ITU-R BT.709-5) and extends its definition to the wider gamut of colour range.

---------------------- Page: 9 ----------------------
– 6 – 61966-2-4  IEC:2006(E)
MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –
Part 2-4: Colour management –
Extended-gamut YCC colour space
for video applications – xvYCC
1 Scope

This part of IEC 61966 is applicable to the encoding and communication of YCC colours used

in video systems and similar applications by defining encoding transformations for use in

defined reference capturing conditions. If actual conditions differ from the reference conditions,

additional rendering transformations may be required. Such additional rendering trans-

formations are beyond the scope of this standard.
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.

IEC 60050-845:1987, International Electrotechnical Vocabulary (IEV) – Part 845: Lighting

ITU-R Recommendation BT.601-5:1995, Studio encoding parameters of digital television for

standard 4:3 and wide-screen 16:9 aspect ratios
ITU-R Recommendation BT.709-5:2002, Parameter values for the HDTV standards for
production and international programme exchange
3 Terms and definitions

For the purposes of this document, the following terms and definitions, as well as those

concerning illuminance, luminance, tristimulus, and other related lighting terms given in

IEC 60050-845, apply.
3.1
scene-referred colour encoding

representation of estimated colour-space coordinates of the elements of an original scene,

where a scene is defined to be the relative spectral radiance
3.2
output-referred colour encoding

representation of estimated colour-space coordinates of image data that are appropriate for

specified output device and viewing conditions
3.3
extended gamut

colour gamut extending outside that of the standard sRGB CRT display defined in IEC 61966-

2-1
---------------------- Page: 10 ----------------------
61966-2-4  IEC:2006(E) – 7 –
3.4
luma
luminance signal as defined by SMPTE/EG28:1993

NOTE 1 To avoid interdisciplinary confusion resulting from the two distinct definitions of luminance, it has been

proposed that the video documents use “luma” for “luminance, television” (i.e., the luminance signal).

NOTE 2 Video systems approximate the lightness response of vision by computing a luma component Y' as a

weighted sum of non-linear (or gamma-corrected) R'G'B' primary components. Luma is often carelessly referred to

as luminance.
4 Colorimetric parameters and related characteristics

This clause defines colorimetric parameters and the related characteristics of reference

capturing devices.
4.1 Primary colours and reference white

The CIE chromaticities for the reference red, green, and blue primary colours, and for

reference white CIE standard illuminant D65, are given in Table 1. These primaries and

...

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