ISO/TR TECHNICAL REPORT 18942 First edition 2020-04 Imaging materials Evaluation of image permanence of photographic colour prints in consumer home applications Supportd'image-Evaluationde lapermanencede I'imagede tirages couleurphotographiques dans lesapplications domestiques grand public Reference number IS0/TR18942:2020(E) ISO ISO2020 IS0/TR18942:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS02020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+4122749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0/TR18942:2020(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Overview ..1 4.1 General. .1 4.2 ..2 Use case 4.3 Singlefactortestsandtheir limitations .3 .3 4.4 Accelerated tests and the concept of reciprocity 4.5 Concepts and limitations of data reporting. 4 Preparation of test targets and analysis .5 5 5.1 General ..5 5.2 Factors influencing the test results .5 5.2.1 Test design. . 5 5.2.2 Test conditions. .5 5.2.3 Measurements. .6 5.3 Test target. .6 5.3.1 General. .6 5.3.2 Humidity test target (IS0 18946) .10 5.4 Measurement (Density and colorimetric values) .11 5.4.1 General .11 5.4.2 Density values to be measured. .11 5.4.3 Colorimetricvaluestobemeasured ..12 5.4.4 Discussion ofdensitometricand colorimetricapproaches. ..13 5.5 Preconditioning ..14 6 Test methods. .14 6.1 General .14 6.2 Thermal stability .14 6.3 Light stability (Indoor display) .16 6.4 Ozonegasstability .19 6.5 Humidity fastness. .24 7 End of test criteria .27 7.1 General. 27 7.2 Initial optical density and colour 27 7.3 List of several sets of end of test criteria for background explanation. .28 8 Environmental conditions .28 8.1 General 28 8.2 Temperature and humidity 29 8.3 Light. .31 8.4 Ozone. .34 8.5 Conclusion. .37 8.6 General .37 8.7 Basic reporting .37 8.7.1 Graph reporting .37 8.7.2 Fixed-load reporting .39 ..41 8.7.3 Discussion of graph reporting and fixed-load reporting 8.8 Advanced reporting 43 8.8.1 Two advanced reporting methods .43 8.8.2 Reporting"year rating" .43 8.8.3 Reporting"Star rating" ..4 @ IS0 2020 -All rights reserved iii
ISO-TR 18942 2020 Imaging materials Evaluation of image permanence of photographic colour prints in consumer home applications
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