ISO INTERNATIONAL STANDARD 446 Third edition 2004-03-15 Micrographics IsO character and IsO test chart No. 1 Description and use Micrographie - Caractére ISO et mire /SO No 1 Description et utliisation Reference number A ISO 446:2004(E) ISO @ ISO 2004 ISO 446:2004(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 downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat 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 @ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or 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 @ ISO 2004 - All rights reserved ISO 446:2004(E) Contents Page Foreword.. Introductior 1 2 Normativereferences 3 Termsand definitions... 4 Descriptionand useoftheisOcharacter 4.1 Description .... 4.2 Use... 5 ProductionofISOtestchartNo.1 5.1 Base. 5.2 Test chart lay-out. 5.3 Density-measuring areas, 5.4 Identification.. 5.5 CertificationofiSONo.1testcharts 6 Procedure for using Iso test chart No. 6.1 Method.. 6.2 Density of the film. 6.3 Legibility control alion'ghts reserved ii ISO 446:2004(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been 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. 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. Subcommittee SC 1, Quality. This third edition cancels and replaces the second edition (IsO 446:1991), which has been technically revised. @ IsO 2004 - All rights reserved ISO 446:2004(E) Introduction Most processes produce images of lower quality; among others diffusion transfer, if it still exists, is capable of cause visual fatigue after prolonged viewing. The legibility of an image can be assessed by measuring the limit of resolution, i.e. the ability to distinguish lines in different directions. However, the limit of resolution corresponds to a quality level insufficient to permit easy reading, and to prolong it without visual fatigue. conventional character similar to typefaces used in the printing industry, the outline and details of which should be distinguished without difficulty, meets these requirements. The main practical applications of the IsO character are based on the following experimental properties. a) size, a satisfactory image and, in particular, one that is sharp enough to be read, without undu