# ISO/IEC 21122-4:2020 — Withdrawn and superseded ISO standards

For ISO/IEC 21122-4:2020, item title is Information technology — JPEG XS low-latency lightweight image coding system — Part 4: Conformance testing; status code is 9599; successor is ISO/IEC 21122-4:2022; withdrawn / published date is 2020-06-10, recorded from its source on 2026-08-05.

- **Identifier:** ISO/IEC 21122-4:2020 _(verified: appears in the quote below)_
- **Item title:** Information technology — JPEG XS low-latency lightweight image coding system — Part 4: Conformance testing _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/IEC 21122-4:2022
- **Withdrawn / published date:** 2020-06-10 _(verified: appears in the quote below)_

## What the source says

> 74538,IS,,ISO/IEC 21122-4:2020,Information technology — JPEG XS low-latency lightweight image coding system — Part 4: Conformance testing,Technologies de l'information — Système de codage d'images léger à faible latence JPEG XS — Partie 4: Essais de conformité,2020-06-10,1,['35.040.40'],ISO/IEC JTC 1/SC 29,9599,,[82568],['en'],18,"<p>This document specifies the framework, concepts, methodology for testing, and criteria to be achieved to claim conformance to multiple parts of the ISO/IEC 21122 series. It lists the conformance testing procedures.</p><p>This document specifies:</p><p>— Conformance testing procedures for decoders implementing ISO/IEC 21122-1.</p><p>— Conformance testing

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).