JPEG-LS
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* [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] | ||
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Revision as of 22:27, 20 October 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.
- Thomas Richter's libjpeg
- UBC JPEG-LS Codec
- XnView
