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Yep, it's all about the decoded image, the initial format doesn't really tell you much. It's easy to work out, too:
(width*height*bit depth) / 8
to get the size of the image in bytes, regardless of the file size. IFF has the advantage of being able to save in just the number of bitplanes you want, which saves disk space and loading time as no conversion is necessary when it matches the screen's bit depth. Just remember that Workbench locks the first 4 pens, so it might help to set them in PPaint or whatever and remap the image before saving.
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