Don't have Photoshop? Here is a solution!
If you don't have Photoshop but need a software that allows you to do the same things, well there is a solution for you. Don't turn to piracy "Arg"... eventually if you get caught it will cost you an eye, a leg, a hand or even all of them. That's why I'm making this post. To let you all know that there are other great solutions to this problem, and the great thing is that are totally free and legal. To mention some of them:
Hope there are useful for you all!