This text explains the numerous features of the GNU Image Manipulation Program - more affectionately known as "The GIMP" - and is a guide for designers working in a Linux/Unix environment. The GIMP is an open source image editor and design application that parallels Adobe Photoshop in functionality with one exception: it is free. The GIMP runs on virtually all Unix platforms, is included with most commercial Linux distributions, and can be down loaded freely from the Internet. This image manipulation tool can be quite complex, making it hard to overlook the whole functionality. Based on the menu structure of the program, this reference covers GIMP version 1.2. It explains the function of every menu item and offers tips for every day usage. The Appendix explains important terms of image manipulation and contains a table of file formats supported by The GIMP.