1、 IEC 61966-2-4 Edition 1.0 2006-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Multimedia systems and equipment Colour measurement and management Part 2-4: Colour management Extended-gamut YCC colour space for video applications xvYCC Systmes et appareils multimdia Mesure et gestion de la couleur Pa
2、rtie 2-4: Gestion de la couleur Extension de gamme de lespace chromatique YCC pour applications vido xvYCC IEC 61966-2-4:2006 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2006 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may
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16、ires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61966-2-4 Edition 1.0 2006-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Multimedia systems and equipment Colour measurement and management Part 2-4: Colour management Extended-gamut YCC colour space for video a
17、pplications xvYCC Systmes et appareils multimdia Mesure et gestion de la couleur Partie 2-4: Gestion de la couleur Extension de gamme de lespace chromatique YCC pour applications vido xvYCC INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 33.160.40 PRICE COD
18、E CODE PRIX ISBN 978-2-83220-610-2 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez
19、obtenu cette publication via un distributeur agr. colour inside 2 61966-2-4 IEC:2006 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-e
20、lectronic 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 value
21、s . 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 comp
22、ression 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 61966-2-4 IEC:2006 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MULTIMEDIA SYSTEMS AND EQUIPM
23、ENT 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 Nati
24、onal 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, Publi
25、cly 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- govern
26、mental 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
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30、. 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 dire
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32、g 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 dr
33、awn 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 multi
34、media systems and equipment. This bilingual version (2013-03) corresponds to the monolingual English version, published in 2006-01. 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 sta
35、ndard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. 4 61966-2-4 IEC:2006 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC 61966 consists of the following parts, under the general
36、 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 m
37、anagement 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
38、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 co
39、ntents 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. The
40、 contents of the corrigendum of November 2006 have been included in this copy. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this
41、document using a colour printer. 61966-2-4 IEC:2006 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
42、-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 wi
43、de-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 i
44、ndustry (namely ITU-R BT.709-5) and extends its definition to the wider gamut of colour range. 6 61966-2-4 IEC:2006 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 619
45、66 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
46、 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
47、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
48、 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 relate
49、d 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 ou
