Tip: revert pngcrush optimization in Xcode 4.3

When you are adding PNG images to an iOS app, Xcode will optimize and compress them when compiling, using a tool called pngcrush. To revert this optimization back, copy the .png files from the .ipa bundle into some folder and run this in terminal

/Applications/ -dir SOME_DIR -revert-iphone-optimizations -q *.png

SOME_DIR is a destination path, something like ~/temp.