Basic HTML version of Foils prepared 11 May 1997

Foil 36 Multiple-Block GIF Files (Animated GIFs)

From Introduction to HTML--ECS400 fall 97 ECS400 Senior Undergraduate Course -- Spring Semester 97. by Nancy J. McCracken *
The GIF89a specification allows a GIF file to have multiple blocks of data, each with a different image. The images can be set to display one after another or as overlays that partially replace sections of the preceding image. They can be set to have time delays and also to loop.
Multiple-Block GIFs can be created by a program called Construction Set, from Alchemy Mindworks:
  • http://www.north.net/alchemy/alchemy.html

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