1、 IEC 61966-2-2 Edition 1.0 2003-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Multimedia systems and equipment Colour measurement and management Part 2-2: Colour management Extended RGB colour space scRGB Mesure et gestion de la couleur dans les systmes et appareils multimdia Partie 2-2: Gestion de
2、 la couleur Espace chromatique RVB tendu scRVB IEC 61966-2-2:2003 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2003 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, elec
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16、tactez-nous: csciec.ch. IEC 61966-2-2 Edition 1.0 2003-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Multimedia systems and equipment Colour measurement and management Part 2-2: Colour management Extended RGB colour space scRGB Mesure et gestion de la couleur dans les systmes et appareils multimdia
17、 Partie 2-2: Gestion de la couleur Espace chromatique RVB tendu scRVB INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE P ICS 33.160.60; 37.080 PRICE CODE CODE PRIX ISBN 978-2-83220-631-7 Registered trademark of the International Electrotechnical Commission Marque
18、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 obtenu cette publication via un distributeur agr. colour inside 2 61966-2-2 IEC:2003 CONTENTS FOREWORD . 3 INTRO
19、DUCTION . 5 1 Scope . 6 2 Normative references 6 3 Definitions 6 4 Encoding characteristics . 7 4.1 General . 7 4.2 Transformation from CIE 1931 XYZ values to 16-bit scRGB values ( 16 16 16 scRGB scRGB scRGB , , B G R ) 7 4.3 Transformation from 16-bit scRGB values ( 16 16 16 scRGB scRGB scRGB , , B
20、 G R ) to CIE 1931 XYZ values 7 Annex A (informative) Simple transformation between 8-bit sRGB and 16-bit scRGB values . 8 Annex B (informative) Non-linear encoding for scRGB: scRGB-nl and its YCC Transformation: scYCC-nl . 10 Annex C (informative) scRGB background information 12 Bibliography 16 Fig
21、ure C.1 Example workflow using scRGB 15 Table B.1 Quantization relationships using scRGB 11 61966-2-2 IEC:2003 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MULTIMEDIA SYSTEMS AND EQUIPMENT COLOUR MEASUREMENT AND MANAGEMENT Part 2-2: Colour management Extended RGB colour space scRGB FOREWORD 1) The
22、IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical
23、and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governme
24、ntal and non-governmental organizations liaising with the IEC also participate in this preparation. The 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
25、or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for inter
26、national use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards tran
27、sparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be ren
28、dered responsible for any equipment declared to be in conformity with one of its standards. The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning encoding of colour management g
29、iven in Clause 4. The IEC takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right has assured the IEC that he is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world
30、 In this respect, the statement of the holder of this patent right is registered with IEC. Information may be obtained from: Eastman Kodak Company 343 State Street Rochester New York 14650 USA Attention is drawn to the possibility that some of the elements of this document may be the subject of pat
31、ent rights other than those identified above. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61966 has been prepared by Technical Area 2: Colour measurement and management, of IEC technical committee 100: Audio, video and multimedia sy
32、stems and equipment and ISO TC 42: Photography. This bilingual version (2013-03) corresponds to the monolingual English version, published in 2003-01. 4 61966-2-2 IEC:2003 The text of this standard is based on the following documents: FDIS Report on voting 100/556A/FDIS 100/626/RVD Full information
33、on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC 61966 consists of the following par
34、ts, under the general 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 3: Equipment using cathode ray tubes Part 4: Equipment using liquid crystal displ
35、ay panels Part 5: Equipment using plasma display panels Part 7-1: Colour printers Reflective prints RGB inputs Part 8: Multimedia colour scanners Part 9: Digital cameras It is published as a double logo standard. In the ISO the Standard has been approved by 9 P-members out of 10 having cast the vote
36、 The committee has decided that the contents of this publication will remain unchanged until 2007. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. The contents of the corrigendum of August 2003 have been included in this copy. IMPORTANT The c
37、olour 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 document using a colour printer. 61966-2-2 IEC:2003 5 INTRODUCTION The IEC 61966 standards are
38、 a series of methods and parameters for colour measurements and management for use in multimedia systems and equipment applicable to the assessment of colour reproduction. The method of digitization in this part is designed to provide high bit precision, large colour gamut and extended dynamic range
39、 that is linear with respect to scene radiance. Based on IEC 61966-2-1 (sRGB), this colour space is well suited to meet the needs of the multimedia, gaming and computer graphics applications. This standard provides a robust solution to these needs. The white point and colour primaries of the scRGB s
40、olution are directly inherited from the IEC 61966-2-1 (sRGB) standard. The encoding transformations provide all of the necessary information to encode an image. 6 61966-2-2 IEC:2003 MULTIMEDIA SYSTEMS AND EQUIPMENT COLOUR MEASUREMENT AND MANAGEMENT Part 2-2: Colour management Extended RGB colour spa
41、ce scRGB 1 Scope This part of IEC 61966 is applicable to the encoding, editing and communication of relative scene radiance, wide dynamic range, extended colour gamut, and extended bit precision RGB colours as a colour space used in computer systems and similar applications by defining encoding tran
42、sformations. Primaries and white point values of the colour space defined in this standard are identical to CIE chromaticities for ITU-R BT.709-5 reference primaries and CIE standard illuminant D65 as its white point. The scRGB colour space is an extension of sRGB and it is considered compatible wit
43、h sRGB. Additional transformations, such as white point adaptation methods, are beyond the scope of this standard. The appropriate CIE recommendations should be referred to for guidelines in this area. 2 Normative references The following referenced documents are indispensable for the application of
44、 this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(845):1987, International Electrotechnical Vocabulary (IEV) Chapter 845: Lighting 3 Definitions For the purposes of
45、 this document, the following definitions apply. Definitions of illuminance, radiance, tristimulus, and other relating lighting terms are defined in IEC 60050(845). 3.1 output referred colour space a colour space that represents the colorimetry of an output device with specified viewing conditions 3
46、2 wide dynamic range colour space a colour space whose encoding encompasses values below black and above white 3.3 luma luminance signal as defined by SMPTE/EG28: 1993 NOTE Video systems approximate the lightness response of vision by computing a luma component Y as a weighted sum of nonlinear R G
47、B primary components: Each RGB signal is, comparable to the 1/3 power function with an offset defined by L*. Luma is often incorrectly referred to as luminance. 61966-2-2 IEC:2003 7 4 Encoding characteristics 4.1 General The encoding transformations provide unambiguous methods to transform between C
48、IE 1931 XYZ tristimulus values and 16-bit values for each channel of scRGB. The CIE 1931 XYZ values are scaled so that the sRGB black point to white point luminance is 0,0 to 1,0, not 0,0 to 100,0. Y-tristimulus values less than 0,0 in CIE 1931 XYZ space represent values below black. Y-tristimulus v
49、alues greater than 1,0 represent values brighter than relative white. The scRGB components that range from 0 to 16 384 encompass all visible surface colours (from 0,5 to 1,5). The range from 12 288 to 65 535 is used to encode an extended specular range of colours (from larger than 1,0 to 7,4999). 4.2 Transformation from CIE 1931 XYZ values to 16-bit scRGB values
