ISO INTERNATIONAL STANDARD 18944 Third edition 2018-05 Imaging materials Reflection colour photographic prints Test print construction and measurement Materiaux pour I'image -Reflexion des impressions photographiques en couleurs-Mesurageetconstructiond'une impression d'essai Referencenumber IS0 18944:2018(E) ISO @ IS0 2018 IS018944:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 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 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 CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:copyright@iso.org Website: www.iso.org Published in Switzerland ii IS02018-Allrights reserved IS018944:2018(E) Contents Page Foreword iv Introduction. V 1 Scope .1 2 Normativereferences .1 3 Terms, definitions and symbols. 1 3.1 Terms and definitions. 1 3.2 2 Symbols 4 Requirements 2 5 Digital file preparation 2 5.1 Digital test file usage situations 2 5.2 Digital test file general requirements. 3 5.3 Preparing the digital test file. 3 5.3.1 Constructingthe digital file 3 5.3.2 Adapting the digital file 4 5.4 Target print uniformity 4 6 Generating the target prints .4 6.1 Digital print preparation 4 6.2 Sourcepreparation for conventional silvergelatinephotographicmaterials 4 6.3 Configuringthe printing system and generating the target prints. 4 6.4 Conditioningtheprints after printing 5 7 Target print holding and measurement conditions 5 7.1 Measurement timing. 5 7.2 Holding and measurement conditions 5 8 Measurement of test patches. 6 8.1 Measured attributes. 6 8.1.1 General. 6 8.1.2 Densityattributes to be measured 7 8.1.3 Colorimetryvaluestobemeasured 7 6 Calculation of colour changes 7 9.1 General. 7 9.2 Percentdensitychangeinprimary colourpatches 7 9.3 Percentdensitychangein secondary (mixed)colourpatches 8 9.4 Percent density change in composite neutral patch 8 9.5 Colourbalance shiftincomposite neutral patch 8 9.6 Colourbalanceshiftinsecondary (mixed)colourpatches 8 9.7 Colour balance in Dmin patches by colorimetry 9 10 Reporting. .9 10.1 General. 9 10.2 Testreport 9 AnnexA (normative)Required sRGBencodedpatchvaluesfortesttargets,tolerancein opticaldensity (oD)andpatchselectionprocess. .10 AnnexB (informative)Method ofinterpolationforstepwedgeexposures .19 Bibliography .20 @ IS0 2018 - All rights reserved iii