Although i've had iPhones/ipads/ipods for a few years, i've got a brand new two week old MacBook Pro with retina display. I don't want to have to shell out for photoshop but want something that does similar functions. Online i came across gimp as being a very good free alternative but wonder if it is safe. I've always been a PC girl with computers having anti-virus etc so i feeling a little lost when it comes to Mac. Any assistance or in fact free alternatives to gimp would be greatly appreciated.