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Several dozens of 300 DPI black-and-white scans can be stored in less than a megabyte.ĭOC is a document file format that is directly supported by few ebook readers. The advantage of DjVu is that it is possible to take a high-resolution scan (300–400 DPI), good enough for both on- screen reading and printing, and store it very efficiently. The format is designed to decompress very quickly, even faster than vector-based formats. The contained page images are divided in separate layers (such as multi-color, low-resolution, background layer using lossy compression, and few-colors, high-resolution, tightly compressed foreground layer), each compressed in the best available method. Individual files may contain one or more pages. It includes advanced compressors optimized for low-color images, such as text documents. Djvu Format:ĭjVu is a format specialized for storing scanned documents. A subset of the DAISY format has been adopted by law in the United States as the National Instructional Material Accessibility Standard (NIMAS), and K-12 textbooks and instructional materials are now required to be provided to students with disabilities.ĭAISY is already aligned with the EPUB technical standard, and is expected to fully converge with its forthcoming EPUB3 revision. DAISY has wide international support with features for multimedia, navigation and synchronization.

The Digital Accessible Information SYstem (DAISY) is an XML-based open standard published by the National Information Standards Organization (NISO) and maintained by the DAISY Consortium for people with print disabilities. The indexing is both for keywords and for full text search.ĭAISY – ANSI/NISO Z39.86 Format:

Multiple pages and embedded graphics are distributed along with metadata as a single compressed file. cba (ACE)ĬHM format is a proprietary format based on HTML.

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