You can open one of those books that look "right" to you using Sigil, or using whatever archive manager you have installed (because ePub files are basically ZIP archives), and study the cover. The resolution isn't as important as the aspect ratio - just like PageLab said. My guess is that yours is a bit wider and it needs to be taller.
Simply resizing the cover won't do. You will probably need to rescale the background and adjust the other elements into place.
Last edited by DSpider; 04-28-2013 at 05:03 AM.
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