This last technology is still under AT&T license. The foreground and background images are compressed via IW44, and the mask image is compressed using JB2. The file compression is done by dividing an image into several images named background, foreground and mask and using two compression technologies: a wavelet-based technique named IW44 and a compression algorithm called JB2. The different chunk types are used to describe the document, data shared by multiple pages, thumbnails, page dimensions, resolution and rotation. They include image laser separation of text and background, progressive loading, arithmetic coding and lossy compression.Ī DJVU file structure is based on the Interchange File Format, and is composed of several chunks, which are hierarchically organized. This efficiency is the result of the technologies included in the DJVU file format. This allows for the image to be used on the web.
The result has been a high performance file format, which is preferred and recommended by many experts. The main advantage of the DJVU file format is its capacity to store high quality, readable images in a minimum space.
#WHAT IS A .DJVU FILE PDF#
This file format was designed to contain scanned documents, and as an alternative to the PDF file format. The open-source version is called DJVULibre. In order to promote the development of the DJVU file format AT&T grants broad rights to users. The latest specification is version 26 from 2005.ĭespite being an open file format, several patents owned by AT&T apply to some specific aspect of this file type. Originally developed at AT&T Labs in 1998, it is now available under a GNU General Public License.
DJVU file extension refers to the DJVU file format.
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