Graphics Interchange Format: Original specification describing the file layout as originated by CompuServe. Also known as Gif87a

LibTiff: Library for reading and writing TIFF images, and some tools for doing simple manipulations on them

PNG Specification: The official W3C recommendation specification for PNG

Scalable Vector Graphics (SVG) 1.1 Specification: Official specification from the W3C

W3C Scalable Vector Graphics: The SVG home page at the World Wide Web Consortium. Includes news, description, specification, and history