ISO INTERNATIONAL STANDARD 22028-1 Second edition 2016-03-15 Photography and graphic technology Extended colour encodings for digital image storage, manipulation and interchange - Part 1: Architecture and requirements Photographie et technologie graphique - Codages par couleurs étendues pour stockage, manipulation et échange d'image numerique- Partie 1: Architecture et exigences Reference number ISO 22028-1:2016(E) International Organization for Standardization @ IS0 2016 HEJIANG INST OF STANDARDIZATION C15956617 ed without license from IHS IS0 22028-1:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org icensee-ZHEJIANG INST OF STANDARDIZAoISQ 06 - All rights reserved networking permited without license from IHS Not for Resale, 2016/6/2 08:33:4 IS0 22028-1:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions .1 4 Image-state-based digital imaging architecture .8 4.1 General .8 4.2 Scene-referred colour encodings .9 4.3 Picture-referred colour encodings. .10 4.3.1 General. ..10 4.3.2 Original-referred colour encodings .10 4.3.3 Output-referred colour encodings 10 4.4 Colour-rendering transforms.. ..11 4.5 Colour re-rendering transforms ..11 4.6 Film rendering and unrendering transforms ..12 5 Requirements for specifying a colour encoding .12 5.1 Colour encoding hierarchy ..12 5.2 Information needed to define a colour space ..13 5.2.1 General. .13 5.2.2 Colourimetric colour spaces 5.2.3 Colour appearance colour spaces .15 5.2.4 Device-dependent colour spaces. ..16 5.3 Information needed to define a colour space encoding 17 5.3.1 General. 17 5.3.2 Colour space. ..17 5.3.3 Digital encoding method .18 5.3.4 Set of valid colour values .19 5.4 Information needed to define a colour image encoding 19 5.4.1 General. 19 5.4.2 Colour space encoding 20 5.4.3 Image state.. 20 5.4.4 Reference image viewing environment. 21 5.4.5 Set of valid colour values ..22 5.4.6 Reference imaging medium .23 Annex A (informative) Example system workflows ..24 Annex B (informative) Characteristics of existing colour encodings ..34 Annex C (informative) Criteria for selection of colour encoding ..46 Bibliography .52 ii censee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under lic e with ISt ed withoutlicense from IHS Not for Resale, 2016/6/2 08:33:44 IS0 22028-1:2016(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the Iso/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of Iso documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the ele