cocoa touch - Get underlying NSData from UIImage

Question

I can create UIImage from NSData using [UIImage imageWithData:] or [UIImage initWithData:] methods.

I wonder if I can get the NSData back from an existing UIImage? Something on the line of NSData *myData = [myImage getData];

Answer 1

NSData *imageData = UIImageJPEGRepresentation(image, 0.7); // 0.7 is JPG quality

or

NSData *imageData = UIImagePNGRepresentation(image);

Depending if you want your data in PNG format or JPG format.