DevIL
Sign in to save'''Developer's Image Library or DevIL''', started by Denton Woods, is a cross-platform image library which aims to provide a common API for different image file formats. It consists of three parts: the main library (IL), the utility library (ILU) and the utility toolkit (ILUT), mirroring the corresponding parts of OpenGL (although the OpenGL Utility Toolkit is not part of the OpenGL specification).
Source code
Developer's Image Library (DevIL) is a cross-platform image library utilizing a simple syntax to load, save, convert, manipulate, filter, and display a variety of images with ease. It is highly portable and has been ported to several platforms.
Excerpt from the source-code README · 257 chars · not written by Vinony