We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Adapting custom Marketing Image
The forums have been a great help so far!
I contracted with an illustrator to provide a cover, spine, and back cover for my book. He provided all of these and we collaborated to produce a great design.
As a result I have the front cover in 415 x 642 (96dpi) in jpg file. This is for ebook cover and I know I only need the front cover..
But I do need the image to be 612 x 792 (72dpi). I have little experience with AdobePS but tried to contort image to desired size. I couldn't manipulate the image without distorting it drastically.
I also know that that for the print book (which i will do later) you need a much larger pixel size. What should i do about adapting the image for my ebook. Should i be contacting the artist---who is incredibly difficult to deal with??? Or is there an easy way to change image without distortion (notice hopeful tone