Instagram 4.1 rolled out Wednesday, letting you straighten photos within the app. As you can see in the pic above, you’re presented with a unique interface when you press the “straighten” icon. You do the straightening after you’ve taken the pic in Instagram, or you can choose any photo in your image library.

The straightening tool is smart. Available only on the iOS version of Instagram 4.1, it first tries to automatically estimate the amount of straightening needed, and then it’s a simple matter to finish the job to perfection with a two-finger multitouch twist. Continue reading →