A package of PostScript and PDF interpreters and conversion utilities commercially distributed by Artifex Software, San Rafael, CA (www.artifex.com). Written in C and running on major platforms, Ghostscript is widely used in printers to provide PostScript and PDF support. It is also used in printer software that converts PostScript and PDF into raster formats as well as viewer applications that render PostScript and PDF on screen. In addition, Ghostscript can be used to convert from PostScript to PDF and vice versa.