Colorize is an interesting and fun iPhone application that allows you to alter pictures by painting them with different color tints. From looking at the pictures that Colorize gives you examples of it may seem difficult to create great images, and it is. When you start out you can either take photo with the iPhone camera or simply take one from your Photo Roll. From here you can focus in on spots, paint over with different color tints from the color spectrum, desaturate spots into black and white, or just erase your progress. How you end up altering your picture is purely up to you as there really is no absolute format for how you want your picture to end up looking.
Colorize is powerful enough to fundamentally change your pictures and create a hyperreal image quality. You can highlight existing colors, eliminate it in other places, or really do whatever you want. This is presented simple enough yet has enough complexity to allow you to really hone your skills at altering your iPhotos.
You are not going to get the kind of in depth controls that you would with a computer program like Adobe Photoshop, but for a cell phone application it is quite impressive. Hopefull Colorize is the sign of fun iPhone apps to come in the future.