DjVu

DjVu
Filename extensions	.djvu, .djv
Internet media type	image/vnd.djvu, image/x-djvu
Magic number	AT&T
Developed by	AT&T Labs – Research
Initial release	1998
Latest release	Version 26; April 2005
Type of format	Image file formats
Contained by	Interchange File Format
Open format?	Yes

DjVu (/ˌdeɪʒɑːˈvuː/ DAY-zhah-VOO, like French "déjà vu"^[2]) 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 providing smaller files than PDF for most scanned documents.^[3] 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.^[4] Like PDF, DjVu can contain an OCR text layer, making it easy to perform copy and paste and text search operations.

Free creators, manipulators, converters, web browser plug-ins, and desktop viewers are available.^[2] DjVu is supported by a number of multi-format document viewers and e-book reader software on Linux (Okular, Evince, Zathura), Windows (Okular, SumatraPDF), and Android (Document Viewer,^[5] FBReader, EBookDroid, PocketBook).

^ "Lizardtech DjVu Reference" (PDF). Cuminas.jp. p. 25. Retrieved 7 December 2021.
^ ^a ^b "DjVu.org – the premier menu for djvu resources". djvu.org. Retrieved 2017-07-02.
^ "What is DjVu – DjVu.org". DjVu.org. Archived from the original on 2019-01-21. Retrieved 2009-03-05.
^ Léon Bottou; Patrick Haffner; Paul G. Howard; Patrice Simard; Yoshua Bengio; Yann Le Cun (1998). "High Quality Document Image Compression with DjVu, 7(3):410–425" (PDF). Journal of Electronic Imaging.
^ Document Viewer, Sufficiently Secure, 2022-04-04, retrieved 2022-04-09

[DjVu3Spec-1] "Lizardtech DjVu Reference" (PDF). Cuminas.jp. p. 25. Retrieved 7 December 2021.

[:0-2] "DjVu.org – the premier menu for djvu resources". djvu.org. Retrieved 2017-07-02.

[DjVu-3] "What is DjVu – DjVu.org". DjVu.org. Archived from the original on 2019-01-21. Retrieved 2009-03-05.

[djvupaper-4] Léon Bottou; Patrick Haffner; Paul G. Howard; Patrice Simard; Yoshua Bengio; Yann Le Cun (1998). "High Quality Document Image Compression with DjVu, 7(3):410–425" (PDF). Journal of Electronic Imaging.

[5] Document Viewer, Sufficiently Secure, 2022-04-04, retrieved 2022-04-09

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