IEC International ISO Standard ISO/IEC10918-4 Information technology-Digital Second edition compression and coding of 2024-05 continuous-tone still images Part 4: APPn markers Technologies de I'information -Compression numerique et codagedes images fixes a modele continu Partie4:MarqueursAPPn BE2024(en) @ISO/IEC2024 IS0/IEC10918-4:2024(en) Foreword ISO (the International Organization for Standardization)and IEC (the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity.ISO and IEC technical committees collaboratein fields of mutual interest.Other international organizations,governmental and non-governmental,in liaison with ISO and IEC,also take part in the work. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives,Part 1.In particular,the different approval criteria needed for the different types of document should be noted. ISO and IECdraw attention tothepossibility that the implementation of this document may involve the use of (a)patent(s).ISO and IEC takenoposition concerning the evidence,validity or applicability ofany claimed patent rights in respect thereof.As of the date of publication of this document,ISO and IEC had not received notice of (a)patent(s)which may be required to implement this document.However,implementers are cautioned that this may not represent the latestinformation,which may be obtained from the patent database available at www.iso.org/patents and https://patents.iec.ch .ISO and IEC shall not be held responsible for identifying any or all such patent rights. Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation of the voluntary nature of standards,the meaning of IsO specific terms and expressions related to conformity assessment,as well as information about IsO's adherence to the World Trade Organization(WTO)principles in the Technical Barriers to Trade (TBT)see www.iso.org/iso/foreword.html Inthe IEC,see www.iec.ch/understanding-standards . This document was prepared by ITU-T (as ITU-T Rec T.86)and drafted in accordance with its editorial rules, in collaboration with Joint Technical Committee ISO/IEC JTC 1,Information technology,Subcommittee SC 29 Coding ofaudio,picture,multimedia and hypermedia information. This second edition cancels and replaces thefirst edition (ISO/IEC 10918-4:1999),which hasbeen technically revised.It alsoincorporatestheAmendmentISO/IEC10918-4:1999/Amd1:2013. The main changes are as follows: cancels the provisions concerning the registration authority processes originally defined in the first edition. A list of all parts in the ISO/IEC 10918 series can be found on the ISO and IEC websites. Any feedback or questions on this document should be directed to the user's national standards body.A complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national committees OISO/IEC 2024-All rights reserved ii 10918-4:2024(en) ISO/IEC CONTENTS Page 1 Scope 2 Normativereferences 2.1 Identical ITU-TRecommendations InternationalStandards 3 Definitions 4 Abbreviationsand symbols 5 Conventions 6 General 7 Purposeof anAPPn marker Annex A- Application-specific marker list Bibliography .... O ISO/IEC 2024-Allrights reserved Rec .ITU -T T .86( V2)(02/2024) iv