IOS Retina Display: does "@ 2x" support jpeg as well as png?

Question

Can someone confirm or deny whether the iPhone retina screen supports the "@ 2x" scheme for jpeg, as well as png?

Thanks,
Doug

Answer 1

According to Apple documentation

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIImage_Class/Reference/Reference.html

UIImage supports JPEG, and also automatically applies the @ 2 name modifier when working on a device with a Retina display.

Answer 2

Yes Yes. No difference in that.

Answer 3

Yes, they can, because UIImage itself supports the jpeg file format, as indicated in the table above here: http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImage_Class/Reference/Reference.html