1、 IEC 61966-12-2 Edition 1.0 2014-04 INTERNATIONAL STANDARD Multimedia systems and equipment Colour measurement and management Part 12-2: Simple metadata format for identification of colour gamut IEC 61966-12-2:2014-04(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerlan
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11、surement and management Part 12-2: Simple metadata format for identification of colour gamut INTERNATIONAL ELECTROTECHNICAL COMMISSION Q ICS 17.180.20; 33.160 PRICE CODE ISBN 978-2-8322-1481-7 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained
12、this publication from an authorized distributor. 2 IEC 61966-12-2:2014 IEC 2014 CONTENTS FOREWORD . 3 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 A (informative) Conversion from IEC 61966-12
13、-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 61966-12-1 full/medium profile 9 Figure 3 IEC
14、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 Encoded simple metadata format . 13 Table B.3 Conv
15、ersion 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 coordinates for vertices 15 IEC 61966-12-2:201
16、4 IEC 2014 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MULTIMEDIA SYSTEMS AND EQUIPMENT COLOUR MEASUREMENT AND MANAGEMENT Part 12-2: Simple metadata format for identification of colour gamut FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardiza
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26、 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 b
27、e held responsible for identifying any or all such patent rights. International Standard IEC 61966-12-2 has been prepared by technical area 2: Colour measurement and management, of IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this standard is based on t
28、he following documents: CDV Report on voting 100/2129/CDV 100/2276/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. 4 IEC 61966-12-2:2014 IEC 2014 A list of alll parts of the IEC 61966 series, published under the
29、general title Multimedia systems and equipment Colour measurement and management, can be found on the IEC website. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stab
30、ility 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. IEC
31、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 61966-2-4 (xvYCC) were developed in order to be able
32、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 popularity of wide gamut and high dynamic range contents an
33、d 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 displays, as well as the compatibility among different
34、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 displays increases while the colour gamut and the co
35、lour 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 information for colour reproduction. This metadata can apply
36、 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 of the colour gamut of the pictorial content. IEC
37、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 effective, but some ambiguities can occur in practical us
38、e. 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 handle the Gamut ID of incoming contents, if the se
39、nder 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 simple Gamut ID profile standard of this standard
40、has been developed to address this problem. For published parts of this series of standards refer to the IEC website. 6 IEC 61966-12-2:2014 IEC 2014 MULTIMEDIA SYSTEMS AND EQUIPMENT COLOUR MEASUREMENT AND MANAGEMENT Part 12-2: Simple metadata format for identification of colour gamut 1 Scope This pa
41、rt 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 additive three primary colours type displays whose white and black points have t
42、he 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 for controlled colour reproduction even if the displays colour gamut is di
43、fferent 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 provides the simplest, but unambiguous solution for typical CE devices that are
44、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, only the edition cited applies. For undated references, the latest editio
45、n 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 management Part 12-1: Metadata for identification of colour gamut (Gamut ID) IEC 6
46、1966-2-4, 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 Architecture, profile format and data structure Part 1: Based on ICC.2010 3 Terms
47、 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 IEC 61966-12-2:2014 IEC 2014 7 3.2 colour gamut range of colours achievable on a given
48、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 coordinates of the elements of a source image to colour-space coordinates of the elements of a rep
49、roduction 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 CIE-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 C
