BS-EN-61966-2-1-2000 IEC-61966-2-1-1999.pdf

BRITISH STANDARD BS EN 61966-2-1:2000 IEC 61966-2-1:1999 Incorporating Amendment No. 1 Multimedia systems and equipment Colour measurement and management Part 2-1: Colour management Default RGB colour space sRGB The European Standard EN 61966-2-1:2000, with the incorporation of amendment A1:2003, has the status of a British Standard ICS 33.160.60 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61966-2-1:2000 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 September 2000 © BSI 6 August 2003 ISBN 0 580 36416 X National foreword This British Standard is the official English language version of EN 61966-2-1:2000, including amendment A1:2003. It is identical with IEC 61966-2-1:1999, including amendment 1:2003. The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment, 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 publications 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 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 European committee any enquiries on the 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 40, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 143916 August 2003Insertion of new Annex F, Annex G and Annex H Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 61966-2-1 March 2000 + A1 May 2003 ICS 33.160.60: 37.080 English version Multimedia systems and equipment Colour measurement and management Part 2-1: Colour management Default RGB colour space sRGB (includes amendment A1:2003) (IEC 61966-2-1:1999 + A1.2003) Mesure et gestion de la couleur dans les systèmes et appareils multimédia Partie 2-1: Gestion de la couleur Espace chromatique RVB par défaut-sRVB (inclut lamendement A1:2003) (CEI 61966-2-1:1999 + A1:2003) Multimediasysteme und Geräte Farbmessung und Farbmanagement Teil 2-1: Vorgabe-RGB-Farbenraum-sRGB (enthält Änderung A1:2003) (IEC 61966-2-1:1999 + A1:2003) This European Standard was approved by CENELEC on 2000-01-01. Amendment A1 was approved by CENELEC on 2003-03-01. CENELEC members are bound to comply 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 Secretariat 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 as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für 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 61966-2-1:2000 + A1:2003 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B ©SI 11 July 3002 Foreword The text of document 100/104/FDIS, future edition 1 of IEC 61966-2-1, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61966-2-1 on 2000-01-01. 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) 2000-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2003-01-01 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 normative and annexes A, B, C, D and E are informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61966-2-1:1999 was approved by CENELEC as a European Standard without any modification. Foreword to amendment A1 The text of document 100/555A/FDIS, future amendment 1 to IEC 61966-2-1:1999, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 61966-2-1:2000 on 2003-03-01. The following dates were fixed: latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2003-12-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2006-03-01 Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex F is normative and Annex G and H are informative. Endorsement notice The text of amendment 1:2003 to the International Standard IEC 61966-2-1:1999 was approved by CENELEC as an amendment to the European Standard without any modification. 2 egaP EN 6096621:2000 © BSI 6 August 2003 Page 2 EN 6196621:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ?,6%? 8 bpp), and client graphics subsystem is not palletised20 C.6.2 Image has a colour table (8 bpp) and a client display is not palletised.20 C.6.3 Image does not have a colour table (8 bpp) and a client display is palletised20 C.6.4 Image has a colour table (8 bpp) and was created using the default palette and client display is palletised 21 C.6.5 Image has a colour table (8 bpp) and was created using an arbitrary palette and client display is palletised21 Annex D (informative) Typical viewing conditions 22 Annex E (informative) Recommended treatment for viewing conditions23 Annex F (normative) Default YCC encoding transformation for a standard luma-chroma-chroma colour space: sYCC25 Annex G (informative) Extended gamut encoding for sRGB: bg-sRGB and its YCC transformation: bg-sYCC30 Annex H (informative) CIELAB (L*a*b*) transformation37 Bibliography 39 Annex ZA (normative) Normative references to international publications with their corresponding European publications.40 4 egaP EN 6096621:2000 © BSI 6 August 2003 Page 4 EN 6196621:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ?,6%? ?,17528?DQG?LW?LV?FRPPRQ?SUDFWLFH?LQ?WKH?FRORXU?UHSURGXFWLRQ LQGXVWU? 1RWH?WKDW?LW?LV?SUREOHPDWLF?WR?LPSOHPHQW?RQO?YHLOLQJ?JODUH?DQG?QRW?D?YLHZLQJ?FRQGLWLRQ?PRGHO DQG? UHVFDOLQJ? VLQFH? WKLV? LV? 127? FRPSOLDQW? ZLWK? HLWKHU? ()() () ()255128 255128 25502550 = = = (8) (8) (8)(8) sYCCsYCC sYCCsYCC sYCCsYCCsYCC CrrC CbbC YYY (F.2) 24-bit encoding (8-bit/channel) shall be the default sYCC encoding bit depth. Other bit depths may be unsupported for general use. Where other N-bit/channel encoding is supported (8N), the relationship is defined as; Page 25 EN 6012669:2000 © BSI 6 August 2003 Page 25 EN 6196621:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 -66916mA 121 .dne (3002:CEI)E () ()() ()()122 122 12 1 1 = = = NN NN N CrrC CbbC YY (N) (N) (N) sYCCsYCC sYCCsYCC sYCCsYCC (F.2) For 24-bit encoding (8-bit/channel), the non-linear sYCbCr values are transformed to the non- linear sRGB values as follows; = sYCC sYCC sYCC sRGB sRGB sRGB rC bC Y , , , , , , , , , B G R 000000772100001 171401344000001 040210000000001 (F.3) For N-bit/channel encoding (8N), it is recommended to replace the matrix coefficients in the equation F.3 with the coefficients of the inverse matrix of the equation F.12 with enough accuracy decimal points. For example, following matrix with 6 decimal points has enough accuracy for the case of 16-bit/channel. = sYCC sYCC sYCC sRGB sRGB sRGB rC bC Y , , , , , , , , , B G R 135000097877110000001 104714011334400000001 988401103700000000001 (F.3) The non-linear sRGB values are then transformed to CIE 1931 XYZ values as follows: If 450400 ,BGR sRGBsRGBsRGB , () () () 42 42 42 0551 0550 0551 0550 0551 0550 , sRGB sRGB , sRGB sRGB , sRGB sRGB , , , , , , + = + = + = B B G G R R (F.6) Page 26 EN 6096621:2000 © BSI 6 August 2003 Page 26 EN 6196621:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -66916mA 121 .dne (3002:CEI)E 5 For 24-bit encoding (8-bit/channel), the linear sRGB values are transformed to CIE 1931 XYZ values as follows: = sRGB sRGB sRGB B G R , , , , , , , , , Z Y X 595002119030190 207202715062120 518006357044120 (F.7) F.3 Transformation from CIE 1931 XYZ values to sYCC values ( sYCCsYCCsYCC ,CrCbY) The CIE 1931 XYZ values can be transformed to non-linear sRGB values as follows = Z Y X , , , , , , , , , B G R 005710204070550 504108875199680 649802537162403 sRGB sRGB sRGB (F.8) For N-bit/channel encoding (8N), it is recommended to replace the matrix coefficients in the equation F.8 with the coefficients of the inverse matrix of the equation F.7 with enough accuracy decimal points. For example, following matrix with 7 decimal points has enough accuracy for the case of 16-bit/channel. = Z Y X , , , , , , , , , B G R 999505611021204017100550 551704101756875179309680 662849800208537156252403 sRGB sRGB sRGB (F.8) In the sYCC encoding process, negative sRGB tristimulus values, and sRGB tristimulus values greater than 1,0 are retained. If 81300030 ,BGR sRGBsRGBsRGB , ()( ) ()( ) ()( ) 05500551 05500551 05500551 4201 4201 4201 , , , ,/, sRGBsRGB ,/, sRGBsRGB ,/, sRGBsRGB ×= ×= ×= BB GG RR (F.11) The relationship between non-linear sRGB and sYCC is defined as follows: = sRGB sRGB sRGB sYCC sYCC sYCC B G R , , , , , , , , , rC bC Y 308107418005000 050003331071680 011400587002990 (F.12) NOTE The coefficients in equation F.12 are from ITU-R BT.601-5. The ITU-R BT.601-5 defines Y of YCC to the three decimal place accuracy. An additional decimal place is defined above to be consistent with the other matrix coefficients defined in this standard. And quantization for sYCC is defined as; () () ()OffsetrCRangeCr OffsetbCRangeCb KDCYKDCWDCY +×= +×= +×= sYCCsYCC sYCCsYCC sYCCsYCC round round round (F.13) For 24-bit encoding (8-bit/channel), the relationship is defined as: () () ()128255 128255 25500255 +×= +×= ×=+×= sYCCsYCC sYCCsYCC sYCCsYCCsYCC round round roundround (8) (8) (8) rCCr bCCb YYY (F.14) For 24-bit encoding, the sYCC(8) values shall be limited to a range from 0 to 255 after equation F.14. 24-bit encoding (8-bit/channel) shall be the default sYCC encoding bit depth. Other bit depths may be unsupported in general use. Where other N-bit/channel encoding is supported (8N), the relationship is defined as; () ()() ()() 1 1 212 212 12 +×= +×= ×= NN NN N rCCr bCCb YY sYCCsYCC sYCCsYCC sYCCsYCC round round round (N) (N) (N) (F.14) For N-bit/channel encoding (8N), the sYCC(N) values shall be limited to a range from 0 to 2N1 after equation F.14. Page 28 EN 6096621:2000 © BSI 6 August 2003 Page 28 EN 6196621:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -66916mA 121 .dne (3002:CEI)E 7 F.4 Transformation from 8-bit sYCC values ( (8)(8)(8) sYCCsYCCsYCC ,CrCbY) to 8-bit sRGB values ( sRGB(8)sRGB(8)sRGB(8) ,BGR) () ()255128 255128 255 = = = (8) (8) (8) sYCCsYCC sYCCsYCC sYCCsYCC CrrC CbbC YY (F.15) = sYCC sYCC sYCC sRGB sRGB sRGB rC bC Y , , , , , , , , , B G R 000000772100001 171401344000001 040210000000001 (F.16) )(round )(round )(round sRGBsRGB(8) sRGBsRGB(8) sRGBsRGB(8) BB GG RR ×= ×= ×= 255 255 255 (F.17) NOTE Since 8 bit sYCC values are not limited by the gamut of 8 bit sRGB values, some kind of mapping is needed for the colours that contains over-ranged non-linear floating point sRGB tristimulus values (under 0,0 or over 1,0), when converting 8 bit sYCC to 8 bit sRGB. F.5 Transformation from 8-bit sRGB values ( sRGB(8)sRGB(8)sRGB(8) ,BGR) to 8-bit sYCC values ( (8)(8)(8) sYCCsYCCsYCC ,CrCbY) 255 255 255 sRGB(8)sRGB sRGB(8)sRGB sRGB(8)sRGB BB GG RR = = = (F.18) = sRGB sRGB sRGB sYCC sYCC sYCC B G R , , , , , , , , , rC bC Y 308107418005000 050003331071680 011400587002990 (F.19) () () ()128255 128255 255 +×= +×= ×= sYCCsYCC sYCCsYCC sYCCsYCC round round round (8) (8) (8) rCCr bCCb YY (F.20) Page 29 EN 6096621:2000 © BSI 6 August 2003 Page 29 EN 6196621:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 04:06:00 GMT+00:00 2006, Uncontrolled Copy, (