ISO/IEC 18181-4:2022

Information technology — JPEG XL image coding system — Part 4: Reference software

This document provides reference implementations of ISO/IEC 18181-1 and ISO/IEC 18181-2. The software supports lossless and lossy compression of images and image sequences for a wide range of use cases such as (but not limited to) images with wide colour gamut and/or high dynamic range and responsive web images. This document includes source code and instructions for compilation and usage.

Technologies de l'information — Systѐme de codage d'images JPEG XL — Partie 4: Logiciel de référence

General Information

• Status: Published
• Publication Date: 04-Aug-2022
• ICS: 35.040.30 - Coding of graphical and photographical information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29/WG 1 - JPEG Coding of digital representations of images
• Current Stage: 6060 - International Standard published
• Start Date: 05-Aug-2022
• Due Date: 22-Jan-2022
• Completion Date: 05-Aug-2022

Relations

• Splited From: ISO/IEC 18181-1:2022 - Information technology — JPEG XL image coding system — Part 1: Core coding system
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 18181-4
First edition
2022-08
Information technology — JPEG XL
image coding system —
Part 4:
Reference software
Technologies de l'information — Systѐme de codage d'images JPEG
XL —
Partie 4: Logiciel de référence
Reference number
ISO/IEC 18181-4:2022(E)
© ISO/IEC 2022

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ISO/IEC 18181-4:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2022
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
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ISO copyright office
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Published in Switzerland
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  © ISO/IEC 2022 – All rights reserved

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ISO/IEC 18181-4:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reference software . 1
4.1 General . 1
4.2 Examples of use . 2
4.3 Access. 2
4.4 Dependencies . 3
5 Usage instructions . 3
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ISO/IEC 18181-4:2022(E)
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 collaborate in 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. This document was drafted in
accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see https://patents.iec.ch).
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. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 18181 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.
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INTERNATIONAL STANDARD ISO/IEC 18181-4:2022(E)
Information technology — JPEG XL image coding system —
Part 4:
Reference software
1 Scope
This document provides reference implementations of ISO/IEC 18181-1 and ISO/IEC 18181-2. The
software supports lossless and lossy compression of images and image sequences for a wide range
of use cases such as (
...