"Adobe Systems on Friday introduced a new Photoshop app for iPhone users that lets them edit photos from both their phone and their online library on Photoshop.com."

The app is free of charge and offers tools such as cropping, image rotation, color controls, and simple one-touch filter effects that can change the look and feel of shots all at once. It also features undo and redo controls so that if users make a mistake, or want to revert back to the original, it takes just a few taps.