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. The extension does not encode data associated with the software or OS used to develop and view it.cbr (RAR). Any file contains a description of a 2D or 3D document with all the necessary components (scan-line, vector graphics, text, and more). 🔵 PDF supports color models CMYK, RGB, shades of gray, and also it has its technical formats for performing the exchange of finished documents. They are supported by Adobe Reader and many browsers, providing the plugin is installed. Files of this format do not have restrictions on the length, several types, and image options, as they allow you to embed various multimedia tools, scan-line, and vector images. PDF documents can exist separately from the OS or hardware tools with which they were developed.
It is developed by Adobe Systems using separate PostScript resources. 🔵 PDF – is a cross-platform extension necessary for the visualization of printed materials in electronic form.
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