JPEG-LS Public Domain Code

ISO/IEC JPEG-LS "The emerging lossless/near-lossless compression standard for continuous-tone still images"

Our codec implements the JPEG-LS standard as described in the ISO/IEC JTC 1/SC 29/WG 1 (ITU-T SG8) document.

JPEG-LS Tutorial

If you are new to the JPEG-LS coding standard, there is a full technical report on HP web page . You may also want to look at this paper:

M. Weinberger, G. Seroussi, G. Sapiro, " LOCO-I: A Low Complexity, Context-Based, Lossless Image Compression Algorithm, " Proc. IEEE Data Compression Conference, Snowbird, Utah, March-April 1996.

As a quick start you can play with the executable of a Win95/NT based GUI implementation of the jpeg-ls codec .

UBC's JPEG-LS Codec Implementation

The software is available via anonymous ftp at Version 1.1 supports only the lossless part of the standard, while version 2 supports the lossless and near lossless mode of JPEG-LS. Version 2 also supports color and gray level images. Please note that version 2 is based on HP's LOCO-I/JPEG-LS implementation V.0.90.

Current software revision numbers:




Please check this site again for new developments and new releases of our codec. We will be happy to accept any contributions to this codec. You can report bugs in this software to or Please check the current bug list first.