JPEG XS
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== Format details == | == Format details == | ||
| − | From the standard's table of contents, we surmise that there is a still image file format called ''' | + | From the standard's table of contents, we surmise that there is a still image file format called '''JXS''', and an [[ISO Base Media File Format|ISOBMFF]]-based format called '''Motion JPEG XS'''. There is also a standard way to use JPEG XS in [[HEIF]]. |
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| + | == Identification == | ||
| + | * Can be wrapped in an ISOBMFF-based file format ([https://gitlab.com/wg1/jpeg-xl/-/blob/master/tools/box/box.cc implementation], see [https://gitlab.com/wg1/jpeg-xl/-/blob/main/doc/format_overview.md format overview]), similar to [[JPEG XL]]: | ||
| + | ** the first 4 bytes would be the size of the box (<code>00 00 00 0C</code>, meaning 12 bytes long), | ||
| + | ** the box ID would be <code>4A 58 53 20</code> (in ASCII <code>JXS </code>) and | ||
| + | ** the box content would be the overall signature <code>0D 0A 87 0A</code>. | ||
== Specifications == | == Specifications == | ||
| − | |||
| − | * ISO/IEC 21122 - JPEG XS low-latency lightweight image coding system | + | * ISO/IEC 21122 - JPEG XS low-latency lightweight image coding system. ''(These documents are probably not free to download.)'' |
** [https://www.iso.org/standard/74535.html ISO/IEC 21122-1:2019] - Part 1: Core coding system | ** [https://www.iso.org/standard/74535.html ISO/IEC 21122-1:2019] - Part 1: Core coding system | ||
** [https://www.iso.org/standard/74536.html ISO/IEC 21122-2:2019] - Part 2: Profiles and buffer models | ** [https://www.iso.org/standard/74536.html ISO/IEC 21122-2:2019] - Part 2: Profiles and buffer models | ||
Latest revision as of 10:55, 10 February 2024
JPEG XS is a compressed image and video format, and related standards. It is published as ISO/IEC 21122. As of 2019-08, all the critical parts of the standard had been published.
Contents |
[edit] Format details
From the standard's table of contents, we surmise that there is a still image file format called JXS, and an ISOBMFF-based format called Motion JPEG XS. There is also a standard way to use JPEG XS in HEIF.
[edit] Identification
- Can be wrapped in an ISOBMFF-based file format (implementation, see format overview), similar to JPEG XL:
- the first 4 bytes would be the size of the box (
00 00 00 0C, meaning 12 bytes long), - the box ID would be
4A 58 53 20(in ASCIIJXS) and - the box content would be the overall signature
0D 0A 87 0A.
- the first 4 bytes would be the size of the box (
[edit] Specifications
- ISO/IEC 21122 - JPEG XS low-latency lightweight image coding system. (These documents are probably not free to download.)
- ISO/IEC 21122-1:2019 - Part 1: Core coding system
- ISO/IEC 21122-2:2019 - Part 2: Profiles and buffer models
- ISO/IEC 21122-3:2019 - Part 3: Transport and container formats
- ISO/IEC 21122-4 - Part 4: Conformance testing
- ISO/IEC 21122-5 - Part 5: Reference software
