Paint Shop Pro (PSP) is a bitmap graphics editor and vector graphics editor for computers running the Microsoft Windows operating system that was originally published by Minneapolis-based Jasc Software. In October 2004, Corel Corporation purchased Jasc Software, and with it, the distribution rights to Paint Shop Pro.
Originally called simply Paint Shop, the first version, 1.0, was released in early 1992. Paint Shop was originally distributed as shareware and is still available at many download sites (4.12 being a popular version), newer versions are only available commercially — a key competitor is Adobe Photoshop, the commercial market leader in this category. Photoshop’s popularity is in part because Photoshop is available in an Apple Macintosh version, the platform widely used in the print publication industry, whereas Paint Shop Pro only supports Microsoft platforms.
Paint Shop Pro supports natively both raster and vector graphics, whereas Photoshop only supports importation of vector graphics from Adobe Illustrator without direct built-in editing tools.
PSP functionality can be extended by Photoshop-compatible plugins. They are listed in the 'Effects' menu, below the built-in effects.