Slow down, I’m in a hurry.
—Franz Mairinger (Austrian equestrian)
Color keying was devised in the 1950s as a clever means to combine live-action foreground footage with backgrounds from virtually anywhere. What was once a fragile and expensive proposition is now fully mainstream. Whole films have come to rely on this technique, while The Colbert Report invites anyone with a computer—and more than likely, a copy of After Effects—to try the “Greenscreen Challenge,” which runs entries from none less than John Knoll.