20.4 Other Useful Formats
In this section, we cover the image formats that, although useful to know when using GIMP, are less frequently used.
PostScript and PDF
PostScript is not exactly an image format; rather it is a programming language, designed in 1982 for document page description. Early laser printers, and even many current ones, use PostScript to describe pages being printed. These printers contain an interpreter for the language, and executing this interpreter tells the printer where to put dots on the page.
PostScript is a proprietary language that belongs to Adobe, but its description is public. The Ghostscript interpreter is free software under GPL that lets you print PostScript files on printers that don’t use PostScript (for instance, ...