Graphics Interchange Format

Raster Images:

A raster graphics image, digital image is a data structure representing a generally squared block of pixels, or points of colour.Raster images are commonly stored in image files with varying formats.

The Graphics Interchange Format (GIF) is an 8-bit-per-pixel bitmap image format that was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide Web due to its wide support and portability. “Wikipedia”
 The format uses a palette of up to 256 distinct colors from the 24-bit RGB color space.  It also supports animations and allows a separate palette of 256 colors for each frame.

Uses of GIF file format:

animated GIF – http://i121.photobucket.com/albums/o216/13on/nike5finalfinalcut.gif

Clear GIF – http://www.flickr.com/photos/garmooosha/319080049/