We sill start off by walking though the different parts of a GIF file.
(The information on this page is primarily drawn from the
W3C GIF89a specification.)
A GIF file is made up of a bunch of different "blocks" of data. The following diagram
shows all of the different types of blocks and where they belong in the file. The file starts
at the left and works it's way right. At each branch you may go one way or the other. The
large "middle" section can be repeated as many times as needed. (Technically, it may
also be omitted completely but i can't imagine what good a GIF file with no image data
would be.)
http://matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
http://matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
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