The “gotcha” is that each frame can have its own color map. This reduces file size by avoiding the need to duplicate the static portion of the image n times when only a small portion is actually animated. For example, you can have a 100×100 image, with a sequence of 50×50 frames, if all the animation occurs in a quadrant of the overall image. I may have the terminology wrong here, but the individual image frames can be smaller than the overall picture frame. That’s how animated GIFs work - like the more complex video representations, they can store a sequence of frames (with timing information). This might not be what you’re seeing, but, contrary to widespread belief, GIF images can have more than 256 colors.
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