DjVu

DjVu (pronounced deja-vu) is a computer file format designed primarily to store image scanner images. It features advanced technologies such as image layer separation, progressive loading, arithmetic coding, and lossy compression for bitonal images, allowing for high quality, readable images to be stored in a minimum of space.

Progressive loading makes the format ideal for images served over the Internet. DjVu has been promoted as an alternative to Portable Document Format, actually outperforming PDF on most scanned documents. This has led to its widespread use in distributing math books on file sharing networks. Like PDF, DjVu can contain an Optical character recognitioned text layer, making it easy to perform cut and paste operations.

The DjVu technology was originally developed by Yann Le Cun, Léon Bottou Patrick Haffner and Paul G. Howard at AT&T Laboratories in 1996. DjVu is an Open File Format. The file format specification is published as well as source code for the reference library. The ownership rights to the commercial development of the encoding software have been transferred to different companies over the years, including AT&T and LizardTech. The original authors maintain a GPLed implementation named [http://djvulibre.djvuzone.org/ DjVuLibre] .

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=External links=

*[http://djvulibre.djvuzone.org A free open source implementation of DjVu] *[http://www.djvuzone.org/ DjVuZone.org Very big non-commercial resource about DjVu] *[http://fax.libs.uga.edu/ Facsimile Books & other digitally enhanced Works from: THE UNIVERSITY OF GEORGIA LIBRARIES] (searchable DjVu format)