ISO INTERNATIONAL STANDARD 13655 Third edition 2017-07 Graphic technology Spectral measurement and colorimetric computation for graphic arts images Technologie graphique - Mesurage spectral et calcul colorimétrique relatifs aux images dans les arts graphiques Reference number IS0 13655:2017(E) so International Organization for Standardization @ IS0 2017 ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS underI ted without license from IHS IS0 13655:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ07 -All rights reserVed Not for Resale, 2017/9/11 05:23:17 etworking permitted without license from IHS IS0 13655:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope 2 Normative references 3 Terms and definitions 4 Spectral measurement requirements 4.1 Instrumentstandardizationandadjustment .4 4.2 Reflectance factor measurement. ..4 4.2.1 Wavelength range, wavelength interval and bandwidth. .4 4.2.2 Illumination requirements and measurement conditions 4.2.3 Sample backing material. 7 4.2.4 Measurement geometry 1 4.2.5 Data reporting. .7 4.3 .8 Wavelength range, wavelength interval and bandwidth .8 4.3.1 4.3.2 Measurement geometry .8 4.3.3 Illumination requirements and measurement conditions ..8 4.3.4 Resolution and data reporting. ..8 4.4 Self-luminous displays (spectral radiance) measurement. 4.4.1 Wavelength range, wavelength interval and bandwidth .9 4.4.2 Measurement geometry ..9 4.4.3 Polarization ..9 4.4.4 Resolution and data reporting. ..10 5 Colorimetric computation requirements ..10 5.1 Calculation of tristimulus values for reflecting and transmitting samples ..10 5.1.1 General .10 5.1.2 Calculations with data having 5 nm interval and bandwidth ..11 5.1.3 Calculations with data having 10 nm interval and bandwidth .11 5.1.4 Calculations with data having other intervals and bandwidth .11 5.2 Calculation of tristimulus values for self-luminous displays .11 5.3 CIE 1976 (L*a*b*) colour space; CIELAB colour space. ..13 5.3.1 General. 5.3.2 CIELAB colour space formulae ..13 5.3.3 CIE 1976 colour difference formulae .14 5.3.4 CIEDE2000 colour difference formulae .14 6 Measurement data reporting requirements .15 6.1 Required information. .15 6.2 Recommended information ..15 6.3 Electronic data reporting. ..15 Annex A (normative) Sample backing ..16 Annex B (informative) Geometry .21 Annex C (informative) Improving inter-instrument agreement ..24 Annex D (informative) Certified reference materials (CRMs) .26 Annex E (informative) Procedures for widening the bandwidth .28 Annex F (informative) Fluorescent specimens .30 Annex G (normative) Test method for UV-cut conformance .32 Annex H (informative) Special cases: Use of polarization ..34 iii ee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 cense withISC ted without license from IHS Not for Resale, 2017/9/11 05:23:17