Self-Publishers: These are the new guidelines for Cover and Image size and resolution straight from the New KDP Guidelines. This is just the Kindle guidelines, not Smashwords or PubIt (epub). Make of them what you will.
This is for the DISPLAY image…the one on your Product page at the Kindle Store… not the cover on your book that is fairy-conveyed to a reading device. So this is the Cover that you upload via KDP…not the one attached to your book.mobi/prc. KDP will accept “Display Cover Art” of 1000×625 to 2500×1562 pixels and with high resolution (they say 300dpi, but that’s pretty big… they say they can compress it.
Then for your interior images, make sure each image is not more than 257kb in size (that actually is double what they originally wanted). So send your e-book designer (I previously called myself a ‘formatter’ but decided that I do so much more than formatting… so now I’m a Designer) not your Display cover for your product page at KDP, but the smaller sized (less than 257kb and resolution = 96dpi) cover. Just pass this on to your Cover Artist. They need to give you two covers at least… a big display cover and a cover of 625×1000 is fine, just get it down to 96dpi and send that last one to me (or whoever designs your e-books).
Now the above is specific only for KDP/Kindle… so check with Smashwords and PubIt to see if their rules have changed. I’m really busy right now and just can’t check for you!
I probably just scared all my clients to death about the new guidelines… but the jist of the news from the KDP Newsletter was pretty skewed and led one to believe that these new Cover guidelines where a good thing, but remember there are 2 covers in an e-book… a display cover, and a book cover. The display cover is KDP’s problem, they can compress what you send them, so make it as crisp as you can and make it at least 625×1000 pixels in physical size…they want their webpage to look good.
Gosh I’m tired of reading new ‘guidelines’ every other day! Can technology just take a day off once in awhile! Please!!!