He starts out, "Have you ever taken a photo that turned out to be, well, pretty drab?" Well, it's John Carter to the rescue. He goes on to say, "There is a simple technique you can use in iPhoto for enhancing the color of a photo (Edit -> Adjust, increase Definition), but sometimes it just isn’t enough or give you the result you were hoping for. You can vastly improve the color of any photo using layers in either Photoshop or GIMP. One contributor to Digital Photograpy School has provided detailed steps in two different posts, one for Photoshop and one for GIMP. Give it a try on one of your photos."