| Graphics Interchange Format: Original specification describing the file layout as originated by CompuServe. Also known as Gif87a. |
| Compression Links: GIF: Detailed information, specifications, and background of the Graphics Interchange Format. |
| Graphics Interchange Format: Provides detailed specification of file layout, encoding and decoding algorithm, and color space model for gif89a. |
| The GIF Controversy: A 2004 article on the GIF controversy seen from a software developer's perspective. Includes original interviews, a historical perspective, and a detailed bibliography. |
| The gif2png Home Page: Page prepared in 2003 about a program that converts files from GIF to PNG. The conversion preserves all graphic information, including transparency. |
| Unisys/CompuServe GIF Controversy: Old page from the League for Programming Freedom (LPF) on the Unisys patent controversy. |
| US4558302 Patent: The US patent covering the LZW compression algorithm used in GIF images. |
Classical
