GIF (Graphics Interchange Format)
   Obligatory Copyright
   Introduction
   General File Format
   GIF Signature
   Screen Descriptor
   Global Colour Map
   Image Descriptor
   Local Colour Map
   Raster Data
   GIF Terminator
   GIF Extension Blocks
   Glossary
   Interactive Sequences
   Image Packaging & Compression
   Multiple Image Processing
 LZW GIF COMPRESSION
   Encoding
   Decoding