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DJVU file format

File extension
File category
DjVUI was first created by AT&T and functions as technology used for compressing images and has a free and available source code and it proxy to PDF. It allows distribution of scanned documents, photographs and high definition images on the internet. There are an entire set of DjVU viewers, browser add-ons, and devices for execution of binary codes which exists on both windows and Mac devices.
Technical details
In early 1990s and 2000s, the AT&T developed DjVU by Yann LeCun, Leon Bottou, Patrick Haffner, and Paul G. Howard. It is viewed as superior compared to PDF due to its ability to easily convert large amounts of text to DjVU, its small-sized files and people can use it freely. The separation of DjVU is categorized into three types of images that is background, foreground and mask image whose resolution is higher. The compression algorithm IW44 is used for compressing foreground and background images whereas the JB2 is using in compressing mask images. This leads to significant reduction of an image.
LizardTech Browser Plug In
MacDjView Desktop Viewer
Main program
DjVuLibre DjView
AT&T Labs
MIME type