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Thanks, Jellby. Good suggestion.
You mention saving space. One trick I often use for B&W line drawings is to reduce the number of shades of gray. Fifty is ample ;-) That gives quite a saving, and personally I find it difficult to detect any degradation. However, I only know how to do this in ImageMagick; "mogrify -colors 50 image.png", though it must be possible to do the same in Gimp.
I like keeping some kind of "source" images in full size, full colour, and then pass them through an Imagemagick command to shrink them, and possibly use pngcrush as well to save another few bytes, before I use them in the ebook.
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