The theory behind shooting portraits on a green-screen background is a good one: Give yourself a solid color thats easy to select. The problem has always been that it isnt easy to automate extracting subjects from the backgrounduntil now. Heres a method to create a Photoshop action to extract your subjects and place them in a new background.
1 PREPARATION IS EVERYTHING
Your chances of success in a project like this will depend on the work you do up front. You need good, consistent lighting of the green screen, some distance between your subjects and the background to avoid shadows, and all the portraits should be framed in a similar way. Also, keep your graphic elements in a specific folder. For our example were going to use a series of karate kids.