This tutorial offers up some useful advice on how to whiten teeth -- within an image, of course.
If, despite your best efforts, one of your subjects in an image has nasty yellow or stained teeth, here's your chance to play dentist. The best part is that it's not messy. The worst part is that you can't charge them for a whitening. Here's how to fix it:
1. Open your image. Duplicate the background layer. (You can do this by opening the layers palette and clicking and dragging the background layer down to the bottom of the palette and dropping it on top of the "Create a New Layer" icon.) It's on the right side, just to the left of the tiny little trash can.
2. Using the selection tool you prefer (I used the lasso tool), draw a loose selection around your patient's teeth. It doesn't have to be perfect but try to get it fairly close. Feather your selection (the amount will depend on how large the teeth are in the image, but usually 1-5 pixels will do the trick). To feather your selection, either right click in the center of it immediately after you've drawn it OR go to the top of your screen and click on "Select," then "Feather."
3. After feathering, press "Ctrl-H" (Cmd-H for a Mac). This will hide the annoying "marching ants" that are surrounding your selection. Your selection is still there, it's just not visibly circled by those pesky little insects.
4. Return once again to the layers palette and click on the "Create a New Fill or Adjustment Layer" icon at the bottom (the half-black, half-white circle). When the drop-down menu appears, click on "Hue/Saturation." Go to the top of the Hue/Saturation dialog box and click on the down-facing arrow where you see the word "Master." From the menu that appears, click on "Yellows."
5. Click on the middle slider (labeled "saturation") and slide it to the left. Don't go all the way, just enough to remove the yellow from the teeth. Don't go any further than "just enough" or you'll end your phony dental career by giving your patient gray teeth. When you've got the teeth the color you want, click "OK."
6. If you're satisfied with the result, yell "VOILA!" or "EUREKA!" or some other silly word that no one in their right mind would ever actually use, then flatten your image and save it (as always, save it with a different name than the original).
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