Why are screen shots on the 4S saved as PNGs, and not as JPGs? Photos I take with the built in camera are saved as JPGs. Is there a way to change the default screen shot save to .JPG?
If you don't, in short: PNG is a lossless format (no information is lost when compressing images) and it's better for screenshots (better for text, art, images where high contrast transitions occur, like in cartoons or user interfaces).