How do green screens work?

Movies can take us to extraordinary places, sometimes using technology! Filmmakers create new worlds, incredible creatures, and mind-bending action scenes using something called a green screen. A green screen is just what it sounds like: a bright lime green background used to create special effects! So how does a green screen make movie magic? We asked movie-maker and film professor Jeremy Royce to help us find the answer. Got a question playing in the theater of your mind? Direct it to us at BrainsOn.org/contact, and we’ll help screen out the answer.