screenshots look blurred when enlarged
I've uploaded a set of screenshot images that conform precisely with iBooks Store guidelines, but get very disappointing results.
The images are PNGs, 2048 x 1496, (status bars removed), in RGB color space, and the original artwork is sharp and crisp.
But when I tap on them as they appear in the Store description, on the iPad, they go full screen and look extremely poor quality. It would probably be fine, if it was not possible to enlarge them, but it's useless as they are. They do not represent the quality of the book at all.
Anyone else experiencing this, and able to suggest a solution?
MacBook Pro, OS X Mavericks (10.9.5)