ISO INTERNATIONAL STANDARD 17957 First edition 2015-04-01 Photography Digital cameras - Shading measurements Photographie - Caméras numeriques - Mesurages d'ombrage Reference number IS0 17957:2015(E) @ IS0 2015 IS0 17957:2015(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2015 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 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 ii @ IS0 2015 - All rights reserved IS0 17957:2015(E) Contents Page Foreword ..iv Introduction, ..V 1 Scope. 1 2 Normative references 3 Terms and definitions 1 4 Test conditions and methods ..1 4.1 General 1 4.2 Apparatus and hardware 4.3 Lighting. 2 4.4 Test chart 2 4.5 Image/camera settings 2 5 Analytical approach .3 5.1 General .3 5.2 Lightness non-uniformity 4 5.3 Luminance non-uniformity ..4 5.4 Chrominance non-uniformity .5 5.5 Total colour non-uniformity ..5 6 Presentations of results ..5 Annex A (normative) Recommended measurement condition ..7 Annex B (informative) Example of shading metric calculation 8 Bibliography .13 iii @ IS0 2015 - All rights reserved