Convert PDF to DJVU

.pdf

Adobe Viewer

PDF – is a cross-platform extension necessary for the visualization of printed materials in electronic form. It is developed by Adobe Systems using separate PostScript resources. PDF documents can exist separately from the OS or hardware tools with which they were developed. 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. They are supported by Adobe Reader and many browsers, providing the plugin is installed.

PDF supports color models CMYK, RGB, shades of gray, and also it has its technical formats for performing the exchange of finished documents. Any file contains a description of a 2D or 3D document with all the necessary components (scan-line, vector graphics, text, and more). The extension does not encode data associated with the software or OS used to develop and view it.

Adobe Systems

.djvu

DjVuLibre DjView

AT&T and functions first created DjVU as the technology used for compressing images and has a free and available source code, and it proxy to PDF. It allows the distribution of scanned documents, photographs, and high definition images on the internet. There are an entire set of DjVU viewers, browser add-ons, and devices to execute binary codes that exist on both Windows and Mac devices.

In early 1990s and 2000s, AT&T developed DjVU by Yann LeCun, Leon Bottou, Patrick Haffner, and Paul G. Howard. It is viewed as superior compared to PDF due to its ability to convert large amounts of text to DjVU easily, its small-sized files, and people can use it freely. The separation of DjVU is categorized into three types of images: background, foreground, and mask image, whose resolution is higher. The compression algorithm IW44 is used for compressing foreground and background images, whereas the JB2 is using in compressing mask images. This leads to a significant reduction of an image.

AT&T Labs