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Originally Posted by
proseak
1) Open both images in PS. Go to the darker of the two, Ctrl+A, Ctrl+C, Ctrl+tab(you should now be on the lighter image), and Ctrl+V. Click on the "add layer mask" icon at the bottom of the Layers palette. Now, make the background layer active, and Ctrl+A, Ctrl+C. Alt+click on the mask on layer 1 - it should go white. Ctrl+v, and you should see a greyscale version of the background. Blur "to taste", say 15-50 Gaussian. At this point, you can just click on the background layer in the Layers palette; with any luck, that will be it.
There is another point of control that you may find useful. However, at this point it goes a bit version specific - i use CS3, and for me the way to go is Window> Arrange >New Window for <image name>...I do know that it was different in CS2. This new window allows you to preview the effect on the final image of tweaking the mask - I often steepen the curve to achieve a cleaner knockout, for instance.
HTH
Peter