DjVu
 |
|
| Filename extension | .djvu, .djv |
|---|---|
| Internet media type | image/vnd.djvu, image/x-djvu |
| Type code | DJVU |
| Developed by | AT&T Labs – Research |
| Initial release | 1998 |
| Latest release |
Version 26
(June 2006) |
| Type of format | Image file formats |
| Open format? | GNU GPLv2 for DjVu Reference Library and DjVuLibre-3.5; License grants under the GNU GPL for several patents that cover aspects of the library |
| Website | www |
DjVu (/ˌdeɪʒɑːˈvuː/ DAY-zhah-VOO, like French: déjà vu [deʒavy]) is a computer file format designed primarily to store scanned documents, especially those containing a combination of text, line drawings, indexed color images, and photographs. It uses technologies such as image layer separation of text and background/images, progressive loading, arithmetic coding, and lossy compression for bitonal (monochrome) images. This allows high-quality, readable images to be stored in a minimum of space, so that they can be made available on the web.
DjVu has been promoted as an alternative to PDF, promising smaller files than PDF for most scanned documents. The DjVu developers report that color magazine pages compress to 40–70 kB, black-and-white technical papers compress to 15–40 kB, and ancient manuscripts compress to around 100 kB; a satisfactory JPEG image typically requires 500 kB. Like PDF, DjVu can contain an OCR text layer, making it easy to perform copy and paste and text search operations.
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