JPEG-LS
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== Disambiguation == | == Disambiguation == | ||
| − | JPEG-LS files are similar in structure to [[JPEG]], | + | JPEG-LS files are very similar in structure to [[JPEG]], to the extent that JPEG-LS could be considered to be a kind of JPEG, or an extension of JPEG. However, considering that they use different filename extensions, and that few applications that support JPEG support JPEG-LS, JPEG and JPEG-LS should probably be considered to be different and incompatible formats. |
| − | + | The terms "JPEG-LS" and "Lossless JPEG" do not have the same meaning(s). See [[Lossless JPEG]] for more information. | |
== Identification == | == Identification == | ||
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== External links == | == External links == | ||
* [http://www.hpl.hp.com/research/info_theory/loco/ HP Labs LOCO-I/JPEG-LS Home Page] | * [http://www.hpl.hp.com/research/info_theory/loco/ HP Labs LOCO-I/JPEG-LS Home Page] | ||
| − | * [http://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS Wikipedia | + | * [http://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS Wikipedia: Lossless JPEG: JPEG-LS] |
[[Category:JPEG]] | [[Category:JPEG]] | ||
Revision as of 16:26, 23 August 2014
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.
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Disambiguation
JPEG-LS files are very similar in structure to JPEG, to the extent that JPEG-LS could be considered to be a kind of JPEG, or an extension of JPEG. However, considering that they use different filename extensions, and that few applications that support JPEG support JPEG-LS, JPEG and JPEG-LS should probably be considered to be different and incompatible formats.
The terms "JPEG-LS" and "Lossless JPEG" do not have the same meaning(s). 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.
- Thomas Richter's libjpeg
- UBC JPEG-LS Codec
- XnView
