ISO/CIE INTERNATIONAL STANDARD 11664-1 First edition 2019-06 Colorimetry - Part 1: CiE standard colorimetric observers Colorimetrie- Partie 1:Observateurs CIE dereference pour la colorimetrie Reference number ISO/CIE11664-1:2019(E) cie So @IS0/CIE2019 IS0/CIE11664-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT ISO/CIE2019 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 anyform or by anymeans, electronic or mechanical, including photocopying,or posting beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CIE Central Bureau CP 401: Ch.de Blandonnet 8 Babenbergerstrafse9/9A CH-1214 Vernier, Geneva A-1010 Vienna, Austria Phone:+41227490111 Phone:+4317143187 Fax: +41 22 749 09 47 Fax:+4122749 0947 Email:[email protected] Email: [email protected] Website: www.iso.org Website: www.cie.co.at Published in Switzerland ii IS0/CIE2019-All rights reserved