One of the coolest features of Photoshop for iOS is the "Scribble Select" tool. You draw a fat green line around any object you want to keep, and scribble some red into the parts you want to delete. Hit "OK" and a few moments later you have your subject, neatly cut out from the background, better than you could have managed on even the best desktop machine of a few years back.
But what if you aren’t near your iPhone or iPad when you need to do some quick ‘shipping? You need the browser-based Clipping Magic.