With a computer application like Flash, After Effects, or Motion, an animator can combine layers of images and move them around, resize, rotate etc. over time instead of redrawing the entire picture for each frame.
If anyone is transferring iMovie files between the computer lab and your own mac at home, take a look at this suggestion. It looks like the preferred method is to move projects around within iMovie’s built-in file browser. That way it is able to keep all of the associated files together:
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