JPEG-LS

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|subcat=Graphics
 
|subcat=Graphics
 
|extensions={{ext|jls}}
 
|extensions={{ext|jls}}
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|mimetypes={{mimetype|image/jls}}
 
|locfdd={{LoCFDD|fdd000151}}
 
|locfdd={{LoCFDD|fdd000151}}
 
|pronom={{PRONOM|fmt/150}}
 
|pronom={{PRONOM|fmt/150}}
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== Disambiguation ==
 
== Disambiguation ==
JPEG-LS files are similar in structure to [[JPEG]], but for all practical purposes, JPEG-LS is a separate and incompatible format.
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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, given that they use different filename extensions, and that few applications that support JPEG support JPEG-LS, JPEG and JPEG-LS should probably be thought of as different and incompatible formats.
  
Beware of documents which confuse the term "JPEG-LS" with the term "Lossless JPEG". See [[Lossless JPEG]] for more information.
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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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* [http://charls.codeplex.com/ CharLS]: A C++ JPEG-LS library. Includes sample files.
 
* [http://charls.codeplex.com/ CharLS]: A C++ JPEG-LS library. Includes sample files.
 
* [https://github.com/thorfdbg/libjpeg Thomas Richter's libjpeg]
 
* [https://github.com/thorfdbg/libjpeg Thomas Richter's libjpeg]
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* [[Konvertor]]
 
* [http://www.stat.columbia.edu/~jakulin/jpeg-ls/mirror.htm UBC JPEG-LS Codec]
 
* [http://www.stat.columbia.edu/~jakulin/jpeg-ls/mirror.htm UBC JPEG-LS Codec]
* [http://www.xnview.com/ XnView]
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* [http://www.dclunie.com/jpegls.html JPEG-LS Software] (David A. Clunie)
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* [[XnView]]
  
 
== External links ==
 
== External links ==
* [http://www.hpl.hp.com/loco/ HP Labs LOCO-I/JPEG-LS Home Page]
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* [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 article]
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* [http://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS Wikipedia: Lossless JPEG: JPEG-LS]
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[[Category:Compression]]
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[[Category:JPEG]]
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[[Category:JPEG (organization)]]

Revision as of 22:23, 15 October 2019

File Format
Name JPEG-LS
Ontology
Extension(s) .jls
MIME Type(s) image/jls
LoCFDD fdd000151
PRONOM fmt/150
Released 1998

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 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, given that they use different filename extensions, and that few applications that support JPEG support JPEG-LS, JPEG and JPEG-LS should probably be thought of as 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

External links

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