JPEG-LS
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| − | + | '''JPEG-LS''' is an image file format and compressed data format. It supports both lossy and lossless compression. The lossy compression is often called "near-lossless", because the encoder can set a limit on the maximum error. Its compression algorithm is [[LOCO-I]], developed by HP Labs. | |
| − | '''JPEG-LS''' is an image | + | |
== Disambiguation == | == Disambiguation == | ||
| − | + | JPEG-LS files are similar in structure to [[JPEG]], but for all practical purposes, JPEG-LS is a separate and incompatible format. | |
Beware of documents which confuse the term "JPEG-LS" with the term "Lossless JPEG". See [[Lossless JPEG]] for more information. | Beware of documents which confuse the term "JPEG-LS" with the term "Lossless JPEG". See [[Lossless JPEG]] for more information. | ||
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| + | == Identification == | ||
| + | Like [[JPEG]], JPEG-LS files begin with bytes <code>FF D8 FF</code>. | ||
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| + | A JPEG-LS file will contain an 0xF7 ("SOF55" or "JPG7") segment somewhere in it. Often, the 4th byte in the file is 0xF7. | ||
== Related formats == | == Related formats == | ||
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== Specifications == | == Specifications == | ||
| − | * [http://www.itu.int/rec/T-REC-T.87/en ITU-T | + | * [http://www.itu.int/rec/T-REC-T.87/en ITU-T Rec. T.87] |
== Software == | == Software == | ||
| − | * [http://charls.codeplex.com/ CharLS] | + | * [http://charls.codeplex.com/ CharLS]: A C++ JPEG-LS library. Includes sample files. |
== External links == | == External links == | ||
* [http://www.hpl.hp.com/loco/ HP Labs LOCO-I/JPEG-LS Home Page] | * [http://www.hpl.hp.com/loco/ HP Labs LOCO-I/JPEG-LS Home Page] | ||
* [http://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS Wikipedia article] | * [http://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS Wikipedia article] | ||
Revision as of 22:09, 21 August 2013
JPEG-LS is an image file format and compressed data format. It supports both lossy and lossless compression. The lossy compression is often called "near-lossless", because the encoder can set a limit on the maximum error. Its compression algorithm is LOCO-I, developed by HP Labs.
Contents |
Disambiguation
JPEG-LS files are similar in structure to JPEG, but for all practical purposes, JPEG-LS is a separate and incompatible format.
Beware of documents which confuse the term "JPEG-LS" with the term "Lossless JPEG". See Lossless JPEG for more information.
Identification
Like JPEG, JPEG-LS files begin with bytes FF D8 FF.
A JPEG-LS file will contain an 0xF7 ("SOF55" or "JPG7") segment somewhere in it. Often, the 4th byte in the file is 0xF7.
Related formats
JPEG-LS compression can be used in some other file formats, such as JPX, JPM, SPIFF, and DICOM.
Specifications
Software
- CharLS: A C++ JPEG-LS library. Includes sample files.
