GIMP, an acronym for GNU Image Manipulation Program, is the open source software answer to the commercial image manipulation program Adobe Photoshop. First introduced in 1996, the software was developed and is maintained by volunteers and as student projects. It is licensed to users as free software.

The look and feel of GIMP are similar to many of the commercial image editing software packages. The image is displayed on the screen with a pallet of tools and colors on either or both sides. Many of the tools are similar in function as those found in other software packages. Depending on the goals of the photographer, he may be able to reach the same results with Gimp as with commercial packages.

GIMP accepts all common image file types as input. After working with the files, the photographer can output the image in any of the same file types. Image editing functions include the basics such as cropping and adjusting exposure and white balance as well as more complex functions such as clipping and moving. The GIMP interface uses layers of the image much the same was as commercial image editing software. The package also supports the use of plug-ins allowing software offering additional functions to be added to the system.

GIMP Paint Studio, also known as GPS, supplements the software. This software package adds drawing and painting artistic functions to the ability to edit photographic images found in the basic GIMP software. It is also an open-source software package.

Several online sources offer the current versions of GIMP and GPS. In addition, some user groups and online organizations offer tutorials and online training. Programmers looking a challenge may also want to volunteer for the GIMP development team.