The Transparent Screen
Here's the technique, using Photoshop:
1. Take picture with screen out of the way
2. Take picture from same perspecive with screen as you want it in the final image.
3. Copy picture 1 onto picture 2 and align them. Use the polygonal lasso tool to select the area inside the screen in picture 2 BUT THEN COPY OUT OF PICTURE 1. Paste into a new file. You now have the image that appears behind the screen, but it's not square.
4. Use distort (Edit->Image->Distort) and drag the corner handles around until the image is square and just barely fills the frame. You may have to make two passes around each corner as they have some effect on eachothers alignment. You'll probably also want to turn off snapping (view->snap) so it doesn't fight your alignment fine-tuning.
5. Adjust the image size (Image->Image size) to rescale to your screen resolution. Constrain proportions should be off and resample should be on for this to work right.
6. Switch to full-screen mode (the button on the right, near the bottom of the toolbar)
7. Zoom in until it fills the screen (Ctrl + )
8. Hide the toolbars (tab)
9. (Color correct)
10. Take final picture, from the same perspecive as the first two!
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