Here's what I do, when using the chromakey "green screen" so I can add a digital backdrop:
1. Make sure the screen is evenly lit. This is very important.
2. Open image, duplicate original image layer. Click the eyeball to make this layer invisible.
3. Make original image layer active, then paste the digital BG on top of it; the digital BG is now its own layer between the original image and its duplicate.
4. Make the digital BG layer 50% opacity and move/resize it so it has the correct relationship to the image that shows through from underneath. When you have it the way you want it, make it 100% opacity again.
5. Now make the topmost layer, the duplicate of the original image, visible again. The digital BG is now hidden.
6. Use the magic wand to select the green BG, then choose "select/select similar" to pick up any discontinuous pieces. Feather the selection (amount of feathering depends on size of original, try 4 pixels for starters) and delete it.
7. You now see the digital BG wherever there was green. Blow the image up to at least 100% and go in and clean up the selection edges as needed, and you're done.
Robt.
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