JPEG-LS

From Just Solve the File Format Problem
Revision as of 22:09, 21 August 2013 by Jsummers (Talk | contribs)

Jump to: navigation, search
File Format
Name JPEG-LS
Ontology
Extension(s) .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 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.

External links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox