ISO/TR TECHNICAL 17321-5 REPORT First edition 2021-01 Graphic technology and photography - Colour characterization of digital still cameras (DsCs) - Part 5: Colour targets including saturated colours for colour characteristic evaluation test for colorimetric image capture Technologiegraphiqueet photographie-Caracterisation de la couleurdesappareils photonumeriques- Partie5:Cibles de couleurs incluant des couleurs saturées pour I'essai d'évaluation des caracteristiques chromatiques pour la capture d'images en mode colorimétrique Reference number IS0/TR17321-5:2021(E) ISO @IS02021 IS0/TR17321-5:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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 40i: Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland i IS0 2021-All rights reserved IS0/TR17321-5:2021(E) Contents Page Foreword .iv Introduction .. 1 Scope. ..1 2 Normativereferences ..1 3 Terms and definitions ..1 4 Highly-saturated colour targets .2 .2 4.1 General 4.2 Extension of real existing spectra using eigenvector method .2 4.2.1 General. 2 4.2.2 Selection of spectra database. .2 Spectralreconstructionfromtheeigenvector .3 4.2.3 4.3 Artificial (LED-based) spectra whose wavelength peak is on colour-difference- sensitivewavelength(CDSW) .4 4.3.1 General 4 4.3.2 The method to definethecolour-difference-sensitivewavelength (CDsW) .4 4.3.3 Selection ofLEDfor CDSWtargets 6 5 FoM metricfor evaluation of overall sensor spectral sensitivities, used in the digital cameras .8 5.1 General. .8 5.2 Evaluationmetricsforosss 8 5.3 AdvantagesanddisadvantagesofE(deltaE)evaluation .9 5.4 How17321-5datasets canbeused forF0Ms .9 5.5 Workedexamples .11 Annex A (informative) Selection and eigenvectors of spectral distribution set ..13 AnnexB (informative)Colourgamutofboundarycolour ..15 Annex C (informative) Worked examplefor spectral distribution generation of Pointer's surface colours .16 AnnexD (informative)BackgroundinformationfordefiningCDSW .26 Annex E (informative) Additional 410nm to colour-difference-sensitive wavelengths (CDSW) ..29 AnnexF (informative)ColourdifferencesofpatchesofcDsWtarget. ..30 Annex G (informative) Spectral distribution of CDSW targetfor ITU-R BT.2020 .31 Annex H (informative) Spectral distribution dataset for users to download ..34 Bibliography .35 @ IS0 2021 - All rights reserved iii