ISO INTERNATIONAL STANDARD 21550 First edition 2004-10-01 Photography Electronic scanners for photographic images Dynamic range measurements Photographie Scanners électroniques pour images photographiques - Mesurages d'intervalles dynamiques Reference number ISO 21550:2004(E) Copyright International Organization for Standardization ISO2004 Not for Resale ISO21550:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below @ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland Copyightinteratinal organization for Standardization @ ISO 2004 - All rights reserved mittedwithout license from IHS Not for Resale ISO 21550:2004(E) Contents Page Foreword IV Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Test chart.. 4.1 Representation and recommended size 4.2 The reflective test chart. 4.3 The transparent test chart. 5 Test conditions.. 5.1 General 5.2 Temperature and relative humidity 5.3 Luminance and colour measurements 5.4 Scanner settings .... 6 Measuring the Scanner OECF 6.1 General.. 6.2 Scanner settings 7 Calculation of the scanner dynamic range... 7.1 Luminance OEcF 7.2 Scanner dynamic range.. 7.3 Determination of the signal to noise ratio. 8 Presentation of results . 8.1 General.. 9 8.2 Scanner OECF... 10 8.3 Scanner dynamic range measurements 11 Annex A (normative) Scanner OEcF Test Patches. 12 Annex B (normative) Density shift to measure IsO scanner d. .13 Bibliography 14 Copyrght International Organizainsandardizaoghtsreserved ili nse from IHS Not for Resale ISO21550:2004(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 International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 21550 was prepared by Technical Committee ISO/TC 42, Photography Copyright Intern ional OrganizationforStandardization @ISO2004-All rightsreserved ISO 21550:2004(E) Introduction usually higher than the actual capabilities of the scanner. This International Standard can be used for photofinishing, professional, graphic arts and consumer scanners. This International Standard specifies methods for measuring the ability of scanners to capture tones especially in the dark areas of the original. The scanner measurements described in this International Standard are performed in the digital domain, using digital analysi