1、 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)colourinsid
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9、l 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
10、 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 CONSOL
11、IDATED 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+AMD2:2021-0
12、7 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
13、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)Compress
14、ion 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)Recom
15、mended 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
16、 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
