PostScript is a page description language (PDL English, page description language), used in many printers and conventional manner, such as transport format graphics files in professional print shops. It is based on the work done by John Gaffney at "Evans & Sutherland" in 1976. The PostScript concept differed fundamentally by using a full programming language to describe a print image. Image that would later be printed on a laser printer or other output device quality, rather than a series of escape sequences of low level (this seems to Emacs, which exploded internal concept similar with respect to editing).
In computing, JPEG (seen most often with the .jpg or.jpeg filename extension) is a commonly used method of lossy compressionfor digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with little perceptible loss in image quality. JPEG compression is used in a number of image file formats. JPEG/Exif is the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the World Wide Web.