For one thing, the aspect ratios of the eInk Kindles are different from the Kindle Fire and different from various other devices running Kindle apps. Kindle eInks with 6" screens have a 600 x 800 px display but the Fire has a 600 x 1024 px display. A 600 x800 px image will fill up an eInk screen but won't fill up the entire Fire screen. Here is what the
Amazon Kindle Publishing Guide states on page 19:
Quote:
Image guideline #9: Controlling image aspect ratio
To preserve aspect ratio of images, both width and height cannot be set to a fixed percentage. Either Width or Height can be set to the fixed percentage (e.g.100%) but then the other should be set to “auto” in order for the reader to preserve the aspect ratio.
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If you want the image to fill up the screen on both devices from top to bottom, then set height=100%. If you want the image to fill up the screen on both devices from side to side, then set width=100%. But don't set both to 100%. Now whether Kindle Previewer will convert this correctly is beyond me. But I think using percent is worth a try since the
Amazon Kindle Publishing Guide suggests using it.