Hi, welcome to TCS!
You would need a special program, like Photofiltre (free - www.photofiltre.com
) and if you decide to do that, I can help you with it if you PM (private message... in User CP) me or somebody else knowledgeable on it. Or you could buy a program like Photoshop or Paint Shop Pro.
If you like, I could make you a signature if you PM me.