1、BSI Standards PublicationMultimedia systems and equipment Colour measurement and managementPart 12-2: Simple metadata format for identification of colour gamutBS EN 61966-12-2:2014National forewordThis British Standard is the UK implementation of EN 61966-12-2:2014. It isidentical to IEC 61966-12-2:
2、2014.The UK participation in its preparation was entrusted to Technical Com-mittee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessar
3、y provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 79783 5ICS 17.180.20; 33.160.60Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Stand
4、ard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61966-12-2:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61966-12-2 May 2014 ICS 17.180.20; 33.160 Engl
5、ish Version Multimedia systems and equipment - Colour measurement and management - Part 12-2: Simple metadata format for identification of colour gamut (IEC 61966-12-2:2014) Systmes et quipements multimdias - mesure et gestion de couleur - Partie 12-2: format de mtadonnes simple pour lidentification
6、 de la gamme de couleurs (CEI 61966-12-2:2014) Multimediasysteme und -gerte - Farbmessung und Farbmanagement - Teil 12-2: Einfaches Metadaten-Format zur Erkennung von Farbumfngen (IEC 61966-12-2:2014) This European Standard was approved by CENELEC on 2014-05-22. CENELEC members are bound to comply w
7、ith 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 CEN-CENELEC Man
8、agement Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, 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 CEN-CENELEC Management Centre has th
9、e same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia
10、, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotec
11、hnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61966-12-2:2014 E BS EN 61966-12-2:2014EN 61966-12-2:2014 - 2 - Foreword The text of document 100/
12、2129/CDV, future edition 1 of IEC 61966-12-2, prepared by technical area 2: Colour measurement and management, of IEC technical committee 100: Audio, video and multimedia systems and equipment was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61966-12-2:2014. The following
13、 dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-02-22 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-05-22 Attention is
14、 drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61966-12-2:2014 was approved by CENE
15、LEC 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 61966-2-5 NOTE Harmonised in EN 61966-2-5 (not modified). BS EN 61966-12-2:2014- 3 - EN 61966-12-2:2014 Annex ZA (normative) Normative
16、 references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references,
17、the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed
18、in this annex is available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60050-845 - International Electrotechnical Vocabulary (IEV) - Chapter 845: Lighting - - IEC 61966-2-4 - Multimedia systems and equipment - Colour measurement and management - Part 2-4: Colour management - Extended-
19、gamut YCC colour space for video applications - xvYCC EN 61966-2-4 - IEC 61966-12-1 2011 Multimedia systems and equipment - Colour measurement and management - Part 12-1: Metadata for identification of colour gamut (Gamut ID) EN 61966-12-1 2011 ISO 15076-1 2005 Image technology colour management - A
20、rchitecture, profile format and data structure - Part 1: Based on ICC.1:2004-10 - - BS EN 61966-12-2:2014 2 IEC 61966-12-2:2014 IEC 2014 CONTENTS INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 Simple description of gamut. 7 5 Relationship with IEC 61966-12-1 9 Annex
21、A (informative) Conversion from IEC 61966-12-2 to IEC 61966-12-1 simple profile 11 Annex B (informative) Example of simple metadata format and conversion to IEC 61966-12-1 simple profile . 13 Bibliography 17 Figure 1 The colour gamut of additive three primary colours type display . 8 Figure 2 IEC 61
22、966-12-1 full/medium profile 9 Figure 3 IEC 61966-12-1 simple profile and IEC 61966-12-2 9 Table 1 Simple metadata format for identification of colour gamut 7 Table 2 Differences of IEC 61966-12-1 simple profile and IEC 61966-12-2 10 Table B.1 Colour gamut for IEC 61966-2-5 opRGB 13 Table B.2 Encode
23、d simple metadata format . 13 Table B.3 Conversion result to CIE-XYZ values for five colour vertices 14 Table B.4 Example for the header 14 Table B.5 Example for the header of description of gamut geometry 14 Table B.6 Example of definition of vertices 15 Table B.7 Example of encoded colour space co
24、ordinates for vertices 15 BS EN 61966-12-2:2014IEC 61966-12-2:2014 IEC 2014 5 INTRODUCTION New technologies in capturing and displaying wide-gamut colour images enable a new market of wide-gamut video colour content creation. Recent video standards for wide gamut colour space encoding such as IEC 61
25、966-2-4 (xvYCC) were developed in order to be able to distribute content with a colour gamut that is extended with respect to classical colour gamuts such as defined by standards ITU-R BT.601 (standard definition television) and ITU-R BT.709 (high definition television). With the increasing populari
26、ty of wide gamut and high dynamic range contents and displays, the variety of colour gamuts of displays is expected to increase. This issue can be an obstacle to adoption of wide-gamut video colour contents in professional content creation since the compatibility of the contents to the employed disp
27、lays, as well as the compatibility among different displays, is not ensured. The term display includes here any video colour reproduction equipment, such as direct view displays and projectors. Thanks to improvements in technology, the variety of colour gamuts and colour reproduction capacities of d
28、isplays increases while the colour gamut and the colour encoding rules of existing colour space encoding standards are fixed. To address this issue, IEC 61966-12-1: “Metadata for identification of colour gamut (Gamut ID)” specifies a colour gamut metadata scheme for video systems including informati
29、on for colour reproduction. This metadata can apply to video content or displays. More specifically, improvements can be achieved if the wide-gamut colour content is created with the knowledge of the display colour gamut as well as if the colour reproduction in the display is done with the knowledge
30、 of the colour gamut of the pictorial content. IEC 61966-12-1 has the capability to describe arbitrary 3D colour gamuts in a given colour space and include the full/medium profile for professional use and the simple profile for consumer use with easier product implementation. This approach is effect
31、ive, but some ambiguities can occur in practical use. For example, if typical CE devices are able to decode the simple profile only, due to CPU and software limitations. In this case, even if a sender device and a receiver device are “based on IEC 61966-12-1 standard“, a) the receiver device cannot
32、handle the Gamut ID of incoming contents, if the sender device sends only full or medium profile. b) the sender device should convert a full profile to a simple one for CE-devices, if the receiver can receive the simple profile only. But the conversion is not possible for all the cases. Therefore, a
33、 simple Gamut ID profile standard of this standard has been developed to address this problem. For published parts of this series of standards refer to the IEC website. BS EN 61966-12-2:2014 6 IEC 61966-12-2:2014 IEC 2014 MULTIMEDIA SYSTEMS AND EQUIPMENT COLOUR MEASUREMENT AND MANAGEMENT Part 12-2:
34、Simple metadata format for identification of colour gamut 1 Scope This part of IEC 61966 specifies the colour gamut metadata format for video systems intended for use in CE (Consumer Electronics) devices. The metadata specified in this part of IEC 61966 is limited to the gamut description of additiv
35、e three primary colours type displays whose white and black points have the same chromaticity. It is fundamentally based on the conventional VESA-EDID format. When associated with content, the simple metadata format defines the gamut for which the content was created. It can be used by the display f
36、or controlled colour reproduction even if the displays colour gamut is different from that of the content. When associated with a display, the simple metadata format defines the display colour gamut. It can be used during content creation to enable improved colour reproduction. This standard provide
37、s the simplest, but unambiguous solution for typical CE devices that are based on colour gamut information communication. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references,
38、only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-845, International Electrotechnical Vocabulary Part 845: Lighting IEC 61966-12-1:2011, Multimedia systems and equipment Colour measurement and managemen
39、t Part 12-1: Metadata for identification of colour gamut (Gamut ID) IEC 61966-2-4, Multimedia systems and equipment Colour measurement and management Part 2-4: Colour management Extended-gamut YCC colour space for video applications xvYCC ISO 15076-1:2005, Image technology colour management Architec
40、ture, profile format and data structure Part 1: Based on ICC.2010 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-845, as well as the following apply. 3.1 content set of video signals in production, post-production or consumption BS EN 61966-12
41、-2:2014IEC 61966-12-2:2014 IEC 2014 7 3.2 colour gamut range of colours achievable on a given colour reproduction medium (or present in an image of that medium) under a given set of viewing conditions Note 1 to entry: It is a volume in colour space. 3.3 gamut mapping mapping of the colour-space coor
42、dinates of the elements of a source image to colour-space coordinates of the elements of a reproduction to compensate for differences in the source and output medium colour gamut capability 4 Simple description of gamut Additive three primary colours gamut can be specified by four combinations of CI
43、E-xy chromaticity values of red, green, blue and white. The gamut is assumed to have the characteristic that combining equal amounts of the three primaries (red, green, blue) produces the chromaticity of white. These values can be encoded according to the gamut CIE-xy chromaticity values used in VES
44、A ENHANCED EXTENDED DISPLAY IDENTIFICATION DATA STANDARD (Defines EDID Structure Version 1, Revision 4). The description includes eight values (CIE-xy chromaticity values for each red, green, blue and white) with 10-bit fixed point form in the range of 0.0-1.0. These display primary and the white po
45、int CIE-xy chromaticity values should be measured in such a way as to minimize the contribution from the display black. In addition to VESA-EDID format, the information of White Absolute Luminance (WAL) and Black Level Ratio (BLR) are included. WAL value is defined in cd/m2and denoted as WY , and en
46、coded into 16-bit unsigned integer form. BLR is defined as Equation (1), and encoded into 16-bit fixed point form in the range of 0.0-1.0. ( )WKYYBLR = (1) where KY is the luminance of black shown in Figure 1; WY is the luminance of white shown in Figure 1. Table 1 shows the total metadata which inc
47、ludes the VESAEDID compatible CIE-xy chromaticity values of red, green, blue and white and BLR and WAL value. The total size of this format is 14 B. Table 1 Simple metadata format for identification of colour gamut Byte# hex Size B Colour characteristic Description 7 6 5 4 3 2 1 0 00 1 Red_x, Red_y,
48、 Green_x, Green_y bits1 & bits0 Rx1 Rx0 Ry1 Ry0 Gx1 Gx0 Gy1 Gy0 01 1 Blue_x, Blue_y, White_x, White_y bits1 & bits0 Bx1 Bx0 By1 By0 Wx1 Wx0 Wy1 Wy1 02 1 Red_x bit9 bit2 Rx9 Rx8 Rx7 Rx6 Rx5 Rx4 Rx3 Rx2 03 1 Red_y bit9 bit2 Ry9 Ry8 Ry7 Ry6 Ry5 Ry4 Ry3 Ry2 BS EN 61966-12-2:2014 8 IEC 61966-12-2:2014 IE
49、C 2014 Byte# hex Size B Colour characteristic Description 7 6 5 4 3 2 1 0 04 1 Green_x bit9 bit2 Gx9 Gx8 Gx7 Gx6 Gx5 Gx4 Gx3 Gx2 05 1 Green_y bit9 bit2 Gy9 Gy8 Gy7 Gy6 Gy5 Gy4 Gy3 Gy2 06 1 Blue_x bit9 bit2 Bx9 Bx8 Bx7 Bx6 Bx5 Bx4 Bx3 Bx2 07 1 Blue_y bit9 bit2 By9 By8 By7 By6 By5 By4 By3 By2 08 1 White_x bit9 bit2 Wx9 Wx8 Wx7 Wx6 Wx5 Wx4 Wx3 Wx2 09 1 White_y bit9 bit2 Wy9 Wy8 Wy7 Wy6 Wy5 Wy4 Wy3 Wy2 0A 1 White Absolute Luminance bit15 bit8 (16 bit unsigned
