You see compositing when you watch a TV meteorologist standing in front of a map or other graphic. As shown in the following photos, most times they're standing in front of a green or blue wall. The technical director uses a keying effect to make that wall transparent, and then inserts a weather graphic. You can do the same thing in your video projects using a Premiere Pro video keying effect.
Matt Zaffino, Chief MeteorologistKGW-TV, Portland, Oregon.
Most computer games with live actors, and many movies use compositing. "Green screen" studios enable game developers and film directors to place actors in science fiction and other settings created with 3D computer graphics. Such sets make it possible for actors to work in relative safety while the finished product shows them dangling from a skyscraper, hundreds of feet in the air.
Making keying effects work well takes some extra effort. Proper backdrop colors, lighting, and keying techniques all come into play. You need to consider which keying effect will work best for your circumstances.
Adobe Certified Expert exam objectivesFor most keying shots you need to use a tripod and lock down your camera. Bouncing keyed objects create viewer disconnects. There are exceptions to this rule. Typically, if you're keying in wild, animated backgrounds then camera movement will not be a problem. Most times you want your background (or the other images you'll insert in the transparent areas you create with keying effects) to match those keyed shots. If you're working with outdoor scenes, try to shoot the keyed shots outside or using lights balanced for daylight. Examples of composited clipsBefore you get started on this lesson, take a look at some composited clips I created for the upcoming mini-lessons. This is to give you an idea of some of the compositing techniques that you will work on.
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