Summary
Color repair isn't much different from black-and-white photo repair, except that you need to be a little more aware of the colors and color blending modes. Off-color photos are fixed with Photoshop's regular color adjustment tools. Retouching to get rid of obvious flaws and red eye is best accomplished with the Brush and Eyedropper and with the image enlarged so that you can see what you're doing. Use layers to protect your original while you're working, and merge the changes when you are satisfied with the results.