1、BRITISH STANDARD BS EN 61966-2-2:2003 Multimedia systems and equipment Colour measurement and management Part 2-2: Colour management Extended RGB colour space scRGB The European Standard EN 61966-2-2:2003 has the status of a British Standard ICS 33.160.60; 37.080 BS EN 61966-2-2:2003 This British St
2、andard was published under the authority of the Standards Policy and Strategy Committee on 18 July 2003 BSI 18 July 2003 ISBN 0 580 42277 1 National foreword This British Standard is the official English language version of EN 61966-2-2:2003. It is identical with ISO/IEC 61966-2-2:2003. The UK parti
3、cipation in its preparation was entrusted to Technical Committee CPW/42, Photography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European p
4、ublications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the
5、 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the
6、 interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover a
7、nd a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61966-2-2 NORME EUROPENNE EUROPISCHE NORM July 2003 CENELEC European Committee for Electrotechnical Standar
8、dization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61966-2-2:20
9、03 E ICS 33.160.60; 37.080 English version Multimedia systems and equipment - Colour measurement and management Part 2-2: Colour management - Extended RGB colour space - scRGB (IEC 61966-2-2:2003) Mesure et gestion de la couleur dans les systmes et appareils multimdia Partie 2-2: Gestion de la coule
10、ur - Espace chromatique RVB tendu - scRVB (CEI 61966-2-2:2003) Multimediasysteme und -gerte - Farbmessung und Farbmanagement Teil 2-2: Farbmanagement - Erweiterter RGB-Farbraum - scRGB (IEC 61966-2-2:2003) This European Standard was approved by CENELEC on 2003-03-01. CENELEC members are bound to com
11、ply with 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 Central Se
12、cretariat 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 Central Secretariat has the same status a
13、s the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland an
14、d United Kingdom. Foreword The text of document 100/556A/FDIS, future edition 1 of IEC 61966-2-2, prepared by Technical Area 2, Colour measurement and management, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENE
15、LEC as EN 61966-2-2 on 2003-03-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-02-01 latest date by which the national standards conflicting with the EN have to be wi
16、thdrawn (dow) 2006-03-01 The International Electrotechnical Commission (IEC) and CENELEC draw 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 given in clause 4. The IEC and CENELEC take no position c
17、oncerning 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. In this respect, the statement of the holde
18、r of this patent right is registered with the 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 International Standard/European Standard may be the subject of patent right
19、s other than those identified above. IEC and CENELEC shall not be held responsible for identifying any or all such patent rights. Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normat
20、ive and annexes A, B and C are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61966-2-2:2003 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to
21、 be added for the standard indicated: IEC 61966-2-1 NOTE Harmonized as EN 61966-2-1:2000 (not modified). _ Page2 EN6196622:2003CONTENTS INTRODUCTION 4 1 Scope 5 2 Normative references. 5 3 Definitions 5 4 Encoding characteristics 6 4.1 General 6 4.2 Transformation from CIE 1931 XYZ values to 16-bit
22、scRGB values ( ()()() 16 16 16 scRGB scRGB scRGB , , B G R ) . 6 4.3 Transformation from 16-bit scRGB values ( () () () 16 16 16 scRGB scRGB scRGB , , B G R ) to CIE 1931 XYZ values 6 Annex A (informative) Simple transformation between 8-bit sRGB and 16-bit scRGB values 7 Annex B (informative) Non-l
23、inear encoding for scRGB: scRGB-nl and its YCC transformation: scYCC-nl. 9 Annex C (informative) scRGB background information11 rgoilbiByhpa .61. ugiFrE 1.C examelp workflwo usgni csRGB.41 T 1.B elba Qitnauznoita rnoitalesspih usgni csRGB01 Page3 EN6196622:2003 TNOCENTS NITROCUDTION 4 1 Scepo 5 2 No
24、rmaitve referneces. 5 3 Defnoitinis 5 4 Encgnido cahracetrisitcs 6 1.4 Generla 6 2.4 Trnasformnoita frmo 1391 EIC XYZ seulav 61 ot-tib csRGB seulav ( ()()( 61 61 61 BGRcs BGRcs BGRcs , , B G R ) . 6 3.4 Trnasformnoita frmo 61-tib csRGB seulav ( )( () )( 61 61 61 BGRcs BGRcs BGRcs , , B G R ) 1391 EI
25、C ot XYZ eulavs 6 xennA ( Aifnrom)evita miSrt elpsnafromwteb noita-8 nees tibRGB -61 dnas tibcRGB vaseul 7 xennA ( Bifnroma)evit -noNraenil cnef gnidoor scRGBs :cRGB-nsti dna l YCC trnasform:noita csYCC-nl. 9 xennA C (informa)evit csRGB abckgrni dnuoformoitan11 Bibliography 16 Figure C.1 Example wor
26、kflow using scRGB.14 Table B.1 Quantization relationships using scRGB10 3egaP 3002:2266916NE Annex ZA (normative) Normative references to international publications with their corresponding European publications . 15INTRODUCTION The IEC 61966 standards are a series of methods and parameters for colo
27、ur 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 that is linear with respect to scene radian
28、ce. 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 solution are directly inherited from the IEC
29、61966-2-1 (sRGB) standard. The encoding transformations provide all of the necessary information to encode an image. Page4 EN6196622:2003MULTIMEDIA SYSTEMS AND EQUIPMENT COLOUR MEASUREMENT AND MANAGEMENT Part 2-2: Colour management Extended RGB colour space scRGB 1 Scope This part of IEC 61966 is ap
30、plicable 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 transformations. Primaries and white point values
31、 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 with sRGB. Additional transformations, such as w
32、hite 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 this document. For dated references, only th
33、e 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 this document, the following definitions app
34、ly. 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 3.2 wide dynamic range colour space a colour s
35、pace 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 B primary components: Each RGB signal is, com
36、parable to the 1/3 power function with an offset defined by L*. Luma is often incorrectly referred to as luminance. Page5 EN6196622:20034 Encoding characteristics 4.1 General The encoding transformations provide unambiguous methods to transform between CIE 1931 XYZ tristimulus values and 16-bit valu
37、es 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 values greater than 1,0 represent values bright
38、er 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 1
39、6-bit scRGB values ( () () () 16 16 16 scRGB scRGB scRGB , , B G R ) The relationship is defined as follows: = Z Y X B G R 056996 1 021 204 0 710 055 0 518 041 0 756 875 1 931 968 0 629 498 0 208 537 1 625 240 3 , , , , , , , , , scRGB scRGB scRGB (1) and: () () () () () () 096 4 0 192 8 096 4 0 192
40、 8 096 4 0 192 8 + = + = + = , round , round , round scRGB scRGB scRGB scRGB scRGB scRGB 16 16 16 B B G G R R (2) 4.3 Transformation from 16-bit scRGB values ( () () () 16 16 16 scRGB scRGB scRGB , , B G R ) to CIE 1931 XYZ values The relationship is defined as follows: () ( ) () () () () 5 0 0 192
41、8 5 0 0 192 8 5 0 0 192 8 , , , , , , 16 16 16 scRGB scRGB scRGB scRGB scRGB scRGB = = = B B G G R R (3) and = scRGB scRGB scRGB 5 0,950 2 0,119 3 0,019 2 0,072 2 0,715 6 0,212 5 0,180 6 0,357 4 0,412 B G R Z Y X (4) Page6 EN6196622:2003Annex A (informative) Simple transformation between 8-bit sRGB
42、and 16-bit scRGB values A.1 General This annex describes a simple transformation between 8-bit sRGB and 16-bit scRGB. While more complicated and intelligent tonal rendering should be applied for the scRGB images to obtain the most preferred images, this transformation is targeted to real-time displa
43、y transformations for quick and easy previewing. Other transformations that focus on other requirements are possible. If such other transformations are intended to exchange with other devices or applications, these transformations should be described within the application documentation or file form
44、at as appropriate. A.2 Transformation from 16-bit scRGB values ( () () () 16 16 16 scRGB scRGB scRGB , , B G R ) to 8-bit sRGB values ( () () () 8 8 8 sRGB sRGB sRGB , , B G R ) The relationship is defined as follows: () ( ) () () () () 5 0 192 8 5 0 192 8 5 0 192 8 , , , 16 16 16 scRGB scRGB scRGB
45、scRGB scRGB scRGB = = = B B G G R R (A.1) If () () () ( ) 4095 0 16 16 16 scRGB scRGB scRGB scRGB scRGB scRGB , , , , B G R B G R () () () 0 0 0 = = = 8 8 8 sRGB sRGB sRGB B G R (A.2) else if () () () ( ) 4243 4096 018 0 0 16 16 16 scRGB scRGB scRGB scRGB scRGB scRGB , , , , B G R , B G R () () () (
46、) () () 255 500 4 255 500 4 255 500 4 = = = scRGB sRGB scRGB sRGB scRGB sRGB , round , round , round 8 8 8 B B G G R R (A.3) else if () () () ( ) 12288 4244 0 1 018 0 16 16 16 scRGB scRGB scRGB scRGB scRGB scRGB , , , , , B G R B G R , Page7 EN6196622:2003() () ( ) ( ) () () () () () () () () 255 09
47、9 0 099 1 255 099 0 099 1 255 099 0 099 1 45 0 45 0 45 0 = = = , , round , , round , , round , scRGB sRGB , scRGB sRGB , scRGB sRGB 8 8 8 B B G G R R (A.4) else () () () 255 255 255 = = = 8 8 8 sRGB sRGB sRGB B G R (A.5) A.3 Transformation from 8-bit sRGB values ( () () () 8 8 8 sRGB sRGB sRGB , , B
48、 G R ) to 16-bit scRGB values ( () () () 16 16 16 scRGB scRGB scRGB , , B G R ) The relationship is defined as follows: If () () () 21 0 8 8 8 sRGB sRGB sRGB , , B G R () () ( ) () () () () () () 4096 139 7 4096 139 7 4096 139 7 + = + = + = 8 16 8 16 8 16 sRGB scRGB sRGB scRGB sRGB scRGB , round , round , round B B G G R R (A.6) else () () () () () () () () () + + = + + = +
