Every so often, I like to photograph an album cover to import into iTunes. The problem is usually one of perspective: after taking the photo, I find that the album's top horizontal line might be a little shorter than the bottom horizontal line, with the two vertical lines not being exactly parallel. There is also usually a slight "fish-eye" effect owing to limitations with the iPhone's camera. I'm looking for a good, hopefully inexpensive program for the Mac or iOS that can correct these distortions. I know it can be done because I have OCR apps for the iPhone that will do this; unfortunately, because the app does this to help prepare the image for OCRing, they don't look great as photos. I spent a lot of time last night poking around Photoshop Elements, Preview and iPhoto, but none of them have this functionality. Can anyone recommend a program or app?