Perhaps you've seen websites that feature an on screen guide who walks onto your computer (usually at the bottom of the screen). We will be filming Monday for just that purpose. The trick to creating that effect is to film against a green backdrop, and then key out the green background later in post-production. The goal is to be able to see the website behind the guide and not solid green or white. Green screen video can be tricky, but with solid, continuous lighting on the screen, proper separation of the the talent from the screen, and good keying software, it can be done successfully.