JPEG XT

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File Format
Name JPEG XT
Ontology
Released 2016
JPEG XT is a backward-compatible extension of the JPEG graphics format. It offers higher bit depths, high dynamic range, lossless and near-lossless compression, and transparency.

JPEG XT is similar in concept to JPEG-HDR. Its precise relationship to JPEG-HDR is not clear; the formats do not appear to be compatible.

All the critical parts of the standard were published as of 2016-10-15. The final part of the original standard was published in 2018-03.

Contents

Format details

Like JPEG-HDR, it uses APP11 segments. Unlike JPEG-HDR, the data in those segments uses boxes/atoms format, with the brand "jpxt".

Identification

A JPEG XT file contains one or more APP11 segments (see JPEG#Application segments) whose data begins with ASCII "JP". Note that the signature is just these two bytes, and has no NUL terminator.

Specifications

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