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The real problem is that the reader is mapping pixel size one to one for the graphics — and the graphics were probably composed at a higher pixels-per-inch count than you're expecting. This is a common, but not universal, problem with books originating with certain publishers: When they create e-books, their workflow grabs the for-ink-on-paper graphics and just throws them into the e-book.
For example, a glyph that's supposed to be about 1cm wide may well be more than 400 pixels wide in the bitmap file, because the default resolution for graphics at a lot of publishers is 1200dpi...
There really isn't a universal solution, especially if you've never seen the printed version so you don't know how much of the page the graphic is supposed to take up. I tend to just go in using the editor function, look at how chapter openings are set up, and change the HTML for the image so it references a percentage of page width. That won't catch other problems, though; for that, you've got to read the book on your ereader, then send it back for more editing...
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