For future reference, russerslick, another route, not requiring you to install any additional software (assuming you don't already have Calibre installed):
1. Make a copy of the EPUB file and move it to a new directory.
2. Rename the file copy, changing the file extension from .epub to .zip.
3. Open the zip file, and extract all of the image files.
4. You can now examine the image files - open them in Photoshop, see what size they are, etc.
Once you're finished, and have all the info you need, you can simply delete that directory and its contents, then go back to working on the original EPUB in Sigil.
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