IEC International ISo Standard ISO/IEC18181-2 Second edition Information technology JPEG XL 2024-06 image coding system - Part 2: File format Technologies de I'information - Systeme de codage d'images JPEGXL- Partie2:Formatdefichiers Reference number ISO/IEC 18181-2:2024(en) @ISO/IEC2024 IS0/IEC18181-2:2024(en) COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2024 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: +41 22 749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland @IS0/IEC 2024- All rights reserved i IS0/IEC18181-2:2024(en) Contents Page Foreword. .iv 1 Scope .1 2 Normative references .1 3 Terms and definitions. .1 4 General .2 .2 5 File organization .3 6 Datatypes and numerical values 7 Graphical descriptions .3 8 Binary format ofa box. ..4 9 Boxtypes .4 9.1 JPEGXLSignaturebox .4 9.2 FileType box .5 9.3 .5 Level box ..5 9.4 JUMBF box. 9.5 Exif box. ..5 9.6 XMLbox .6 9.7 Brotli-compressed box .6 9.8 FrameIndexbox. .6 9.9 JPEGXLCodestreambox .7 9.10 JPEGXLPartialCodestreambox .7 9.11 jPEGBitstreamReconstructionDatabox ..8 .11 AnnexA (normative)JPEGBitstreamReconstructionprocedure AnnexB(normative)JPEGXLMediaTyperegistration .15 Bibliography .17 @IS0/IEC 2024-All rights reserved iii