DjVu
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DjVu 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. 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.
DjVu 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. 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.
Format software
any2djvu converts .ps .ps.gz .pdf to .djvu (a DjVu file) via the Any2DjVu server, maintained by Léon Bottou and Yann LeCun, hosted by the Courant Institute of Mathematical Sciences at New York University, with hardware donated by Caminova, Inc. Jakub Wilk's pdf2djvu creates DjVu files from PDF files for GNU/Linux OS (archived), including Ubuntu, and Cygwin (orphaned). The selection of downloadable DjVu viewers is wider on Linux distributions than it is on Windows or macOS. Additionally, the format is rarely supported by proprietary scanning software. DjVu is supported by a number of multi-format document viewers and e-book reader software on Linux (Okular, Evince, Zathura), Windows (Okular and SumatraPDF) and Android (Document Viewer, FBReader, EBookDroid, PocketBook). DjVu.js Viewer is a project that develops a program library, a web application, and browser extensions for Firefox and Google Chrome, to view DjVu files.
Text derived from https://en.wikipedia.org/w/index.php?oldid=1327443386 under CC BY-SA 4.0; modifications have been made.