IEC_61966-2-4-2021.pdf

IEC 61966-2-4 Edition 1.2 2021-07 CONSOLIDATED VERSION INTERNATIONAL STANDARD Multimedia systems and equipment Colour measurement and management Part 2-4:Colour management Extended-gamut YCC colour space for video applications xvYCC IEC 61966-2-4:2006-01+AMD1:2016-04+AMD2:2021-07 CSV(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2021 IEC,Geneva,Switzerland 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 IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigendum or an amendment might have been published.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and once a month by email.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.IEC online collection-oc.iec.ch Discover our powerful search engine and read freely all the publications previews.With a subscription you will always have access to up to date content tailored to your needs.Electropedia-www.electropedia.org The worlds leading online dictionary on electrotechnology,containing more than 22 000 terminological entries in English and French,with equivalent terms in 18 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.INTERNATIONAL STANDARD Multimedia systems and equipment Colour measurement and management Part 2-4:Colour management Extended-gamut YCC colour space for video applications xvYCC INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 00.000 ISBN 978-2-8322-1004-4 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.IEC 61966-2-4 Edition 1.2 2021-07 CONSOLIDATED VERSION colourinside IEC 61966-2-4 Edition 1.2 2021-07 CONSOLIDATED VERSION REDLINE VERSION Multimedia systems and equipment Colour measurement and management Part 2-4:Colour management Extended-gamut YCC colour space for video applications xvYCC IEC 61966-2-4:2006-01+AMD1:2016-04+AMD2:2021-07 CSV(en)colourinside 2 IEC 61966-2-4:2006+AMD1:2016 +AMD2:2021 CSV IEC 2021 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.10 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 B.1 Introduction.14 B.2 Transformation from scRGB values to 8-bit xvYCC.14 Annex C(informative)xvYCC/ITU-R BT.709 and sYCC/sRGB compatibility.16 Annex D(informative)Recommended usage of IEC 61966-12-2 for this standard.18 Annex E(informative)xvYCCext a method for encoding extended luminance signal.19 E.1 General.19 E.2 Extended opto-electronic transfer characteristics.19 E.3 Extended electro-optical transfer characteristics.23 E.4 Digital quantization methods.24 E.5 Image processing consideration.24 Bibliography.25 Figure C.1 Relationship between ITU-R BT.709 and sRGB.16 Figure C.2 Relationship between xvYCC and sYCC.17 Figure A.1 Example of the specular compression method.13 Figure E.1 High luminance region of OETF for the variation of the reference white luminance from 100 cd/m2 to 1 000 cd/m2.21 Figure E.2 Approximation error of OETF.22 Figure E.3 Approximated gamma values in function of reference white luminance.22 Figure E.4 Encoderable luminance in m