I haven't tried this myself, but I believe you can have an image take up more of the screen by using negative margins, but the results may vary by Kindle device and firmware. It might be good enough for your own use, but will not be acceptable if this is a book that you plan to publish.
A bit off topic:
Amazon has a more flexible reflowable e-book format, Kindle Illustrated, which is used by the Kindle in Motion titles. This allows images to be rendered edge-to-edge and also allows the top and bottom overlays (page number, etc.) to be disabled on pages where you need to fill the entire screen. Unfortunately, Amazon has not published any information on how to author books in this format. I have picked up some hints of how it works here and there, but not enough to create a workable book.
Last edited by jhowell; 05-27-2017 at 05:34 PM.
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