Sometimes I take a photo through Pango that ends up with the wrong rotation (usually, it's a photo of the title page or copyright info, and I've held the phone at an odd angle to capture the image while still being gentle with the book spine).

Right now I usually just leave it since it's not easy to get the rotation right—at least, not without angling the phone quite severely and distorting the text that I'm trying to capture—but buyers then have to turn their phones to view the photo correctly.

Being able to edit an image to allow rotation would fix this problem.