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JPEG-LS is the new lossless/near-lossless compression standard for continuous-tone images, ISO-14495-1/ITU-T.87. The standard is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard Laboratories.


The term "near-lossless compression" refers to a lossy algorithm for which each reconstructed image sample differs from the corresponding original image sample by not more than a pre-specified value, the (usually small) "loss." Lossless compression corresponds to loss=0.

An earlier version of the standard draft can be found at the official JPEG Web site.

Comparisons with other lossless image compression schemes.

  • Comparisons with the old lossless JPEG (Huffman and arithmetic), CALIC, FELICS, and PNG can be found in the full paper.

Get HP Labs' software implementation of JPEG-LS

JPEG-LS DLL and Plug-in for Adobe Photoshop

Hewlett-Packard gives free licenses to implementers of JPEG-LS for use of its patented technologies included in the standard.

Click here to read the terms and conditions, and to register your license (you are automatically licensed after reading the terms and conditions, and agreeing to them by submitting a completed Web form).

Other links of interest.

For more details, contact loco@hpl.hp.com.

Last Updated: May 13, 2005

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