ISO IEC TR 19566-9-2024 PDF

Full title and description

Information technology — JPEG Systems — Part 9: JPEG extensions mechanisms to facilitate forwards and backwards compatibility. This ISO/IEC Technical Report documents recommended mechanisms and conventions for extending existing JPEG-related codestreams and box-based file formats so that newly added features remain interoperable with existing decoders and readers.

Abstract

ISO/IEC TR 19566-9:2024 summarizes forward- and backward-compatible extension mechanisms for JPEG codestreams and file formats. It collects principles, container/box conventions, marker and codestream extension points, and profile/level practices to help implementers and standardizers add new functionality without breaking existing implementations. The report is guidance (technical report) rather than a prescriptive encoding specification.

General information

• Status: Published.
• Publication date: 12 August 2024.
• Publisher: ISO and IEC (ISO/IEC JTC 1/SC 29 — Coding of audio, picture, multimedia and hypermedia information).
• ICS / categories: 35.040.30 — Coding of graphical and photographical information.
• Edition / version: Edition 1.0 (first edition, Technical Report).
• Number of pages: 17 pages.

Key bibliographic and publication details above are taken from the ISO and IEC bibliographic records for the document.

Scope

This Technical Report provides guidance on how to extend JPEG codestreams and box-based file formats (including conventions such as file-type/brand boxes, JUMBF metadata boxes, compressed boxes, application markers and CAP markers, and profile/level indicators) so that extensions remain forward- and backward-compatible. It addresses generic extension principles and format-specific extension points for JPEG 1 (baseline JPEG), JPEG 2000, JPEG XS, JPEG XL and other JPEG Systems parts, helping implementers design extensions that degrade gracefully on older decoders and advertise capabilities to newer decoders.

Key topics and requirements

• Principles for designing forward- and backward-compatible extensions (extensibility patterns and graceful degradation).
• Box- and file-format mechanisms: file type/brand boxes, reader-requirements conventions, and use of JUMBF for carrying structured metadata and extension payloads.
• Compressed boxes and techniques for carrying compressed metadata alongside image codestreams.
• Codestream/marker-based extension methods: APP markers, CAP markers, reserved marker strategies and safe marker allocation.
• Profile, level and capability signalling to describe decoder constraints and supported extensions.
• Format-specific guidance for JPEG 1, JPEG 2000, JPEG XS, JPEG XL and other JPEG Systems parts.
• Recommendations for interoperability, conformance reporting and transition strategies when adding new features.
• Guidance intended as best-practice recommendations (Technical Report — informational, not normative encoding rules).

Typical use and users

Implementers of image codecs, file format and container authors, software library developers, device and camera manufacturers, multimedia platform engineers, archivists and digital preservation specialists, and standards working groups will use this report to plan and implement extensions that remain compatible across software and hardware generations. It is particularly useful when designing metadata mechanisms, new markers or new file-box types that must coexist with legacy decoders.

Related standards

Part of the JPEG Systems family (ISO/IEC 19566 series). Closely related documents include ISO/IEC TR 19566-1 (JPEG Systems — Part 1: Packaging of information using codestreams and file formats), ISO/IEC 10918-1 (baseline JPEG), ISO/IEC 15444 (JPEG 2000), ISO/IEC 21122 (JPEG XS), ISO/IEC 18181 (JPEG XL), and the JPEG Universal Metadata Box Format (JUMBF — ISO/IEC 19566-5). This report is complementary to the other JPEG Systems parts and to reference materials such as the ISO/IEC 19566-10 reference software.

Keywords

JPEG, JPEG Systems, forward compatibility, backward compatibility, extensibility, codestream, file format, boxes, JUMBF, markers, profiles, levels, interoperability.

FAQ

Q: What is this standard?

A: ISO/IEC TR 19566-9:2024 is a Technical Report in the JPEG Systems series that describes recommended mechanisms and conventions to extend JPEG codestreams and box-based file formats while preserving forwards and backwards compatibility.

Q: What does it cover?

A: It covers general extensibility principles, file/box-based extension patterns (including use of JUMBF and file-type boxes), compressed metadata boxes, codestream marker allocation and CAP marker usage, and format-specific extension points and capability signalling for JPEG family formats.

Q: Who typically uses it?

A: Codec and library developers, file-format designers, device manufacturers, multimedia platform engineers, archivists, and standards committees — anyone adding features to JPEG-based formats who needs to maintain compatibility with existing implementations.

Q: Is it current or superseded?

A: It is current: the Technical Report was published in August 2024 (publication date 12 August 2024). As a TR, it provides guidance and may be referenced or used as the basis for future normative standards or amendments.

Q: Is it part of a series?

A: Yes — it is part of the ISO/IEC 19566 JPEG Systems multi-part series (Parts 1–10 and related work items), which together define packaging, metadata (JUMBF), 360º imagery, linked media, reference software and other JPEG Systems topics.

Q: What are the key keywords?

A: JPEG, JPEG Systems, JUMBF, forward compatibility, backward compatibility, extensibility, codestream, file format, marker, profile, interoperability.