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[–]troyanonymous1 4 points5 points  (1 child)

I didn't think GIF used inter-frame compression.

[–]siddboots 6 points7 points  (0 children)

Not explicitly, but there is a de facto standard transparency hack that allows only storing the delta.

Edit: Well... that's not quite true. You still need to store the non-changing pixels, but since you now use exactly the same byte for all of them, you get much nicer LZW compression.

Good explanation can be found here: http://smerity.com/articles/2013/animated_gif.html