JPEG XT

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Revision as of 15:22, 16 December 2017 (view source) Jsummers (Talk | contribs) ← Older edit		Revision as of 15:26, 16 December 2017 (view source) Jsummers (Talk | contribs) (→‎Specifications: Updated links) Newer edit →
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	== Specifications ==		== Specifications ==
	''The documents listed here are not necessarily available yet, and if they are, they're probably not free to download.''		''The documents listed here are not necessarily available yet, and if they are, they're probably not free to download.''
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=62552 ISO/IEC 18477-1:2015] - Part 1: Scalable compression and coding of continuous-tone still images	+	* [https://www.iso.org/standard/62552.html ISO/IEC 18477-1:2015] - Part 1: Scalable compression and coding of continuous-tone still images
	** [https://webstore.iec.ch/preview/info_isoiec18477-1%7Bed1.0%7Den.pdf ISO/IEC 18477-1 preview]		** [https://webstore.iec.ch/preview/info_isoiec18477-1%7Bed1.0%7Den.pdf ISO/IEC 18477-1 preview]
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=66070 ISO/IEC 18477-2:2016] - Part 2: Extensions for high dynamic range images	+	* [https://www.iso.org/standard/66070.html ISO/IEC 18477-2:2016] - Part 2: Extensions for high dynamic range images
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=66071 ISO/IEC 18477-3:2015] - Part 3: Box file format	+	* [https://www.iso.org/standard/66071.html ISO/IEC 18477-3:2015] - Part 3: Box file format
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=66072 ISO/IEC 18477-4] - Part 4: Conformance testing	+	* [https://www.iso.org/standard/66072.html ISO/IEC 18477-4:2017] - Part 4: Conformance testing
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=66073 ISO/IEC 18477-5] - Part 5: Reference software	+	* [https://www.iso.org/standard/66073.html ISO/IEC 18477-5] - Part 5: Reference software
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=67168 ISO/IEC 18477-6:2016] - Part 6: IDR Integer Coding	+	* [https://www.iso.org/standard/67168.html ISO/IEC 18477-6:2016] - Part 6: IDR Integer Coding
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=67169 ISO/IEC 18477-7:2016] - Part 7: HDR Floating-Point Coding	+	* [https://www.iso.org/standard/67169.html ISO/IEC 18477-7:2016] - Part 7: HDR Floating-Point Coding
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=68663 ISO/IEC 18477-8:2016] - Part 8: Lossless and Near-lossless Coding	+	* [https://www.iso.org/standard/68663.html ISO/IEC 18477-8:2016] - Part 8: Lossless and Near-lossless Coding
−	* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=68664 ISO/IEC 18477-9:2016] - Part 9: Alpha Channel Coding	+	* [https://www.iso.org/standard/68664.html ISO/IEC 18477-9:2016] - Part 9: Alpha Channel Coding
	== Software ==		== Software ==

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Revision as of 15:26, 16 December 2017

File Format
Name	JPEG XT
Ontology	Electronic File Formats Graphics JPEG XT
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.

Contents 1 Format details 2 Identification 3 Specifications 4 Software 5 Links

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

The documents listed here are not necessarily available yet, and if they are, they're probably not free to download.

• ISO/IEC 18477-1:2015 - Part 1: Scalable compression and coding of continuous-tone still images
  • ISO/IEC 18477-1 preview
• ISO/IEC 18477-2:2016 - Part 2: Extensions for high dynamic range images
• ISO/IEC 18477-3:2015 - Part 3: Box file format
• ISO/IEC 18477-4:2017 - Part 4: Conformance testing
• ISO/IEC 18477-5 - Part 5: Reference software
• ISO/IEC 18477-6:2016 - Part 6: IDR Integer Coding
• ISO/IEC 18477-7:2016 - Part 7: HDR Floating-Point Coding
• ISO/IEC 18477-8:2016 - Part 8: Lossless and Near-lossless Coding
• ISO/IEC 18477-9:2016 - Part 9: Alpha Channel Coding

Software

• Software for JPEG XT
• Thomas Richter's libjpeg

Links

• Overview of JPEG XT