See Use a garbage matte. Add the Simple Choker and other effects as needed to refine the matte. Use a hold-out matte. When you are working with a poorly lit or uneven color screen for example, a bluescreen or greenscreen , sketching a garbage matte around the subject can greatly reduce the amount of work that you have to do in keying out the background. Apply keying effects and Matte effects to the original layer to create transparency. Consider parenting one to the other. 
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Apply Matte effects as necessary to fine-tune the matte. To key well-lit footage shot against multiple colors or unevenly lit footage shot against a bluescreen or greenscreen, keylihht with the Color Range key.
After Effects includes several built-in keying effects, as well as the Academy Award-winning Keylight effect, which excels at professional-quality color keying.
Though the color keying effects built into After Effects can be useful for some purposes, you should try keying with Keylight before attempting to use these built-in keying effects. To key well-lit footage shot against a color screen, start with the Color Difference Key. On the duplicate layer, create masks to mask out everything effect the image except the area that you want to preserve.
If you set keyframes for keying properties, you may want to check the results frame by frame.
Keying in After Effects
You often see composites made with keying techniques in movies, for example, when an actor appears to dangle from a helicopter or float in outer space. See Use a garbage matte.
The Key Cleaner and Advanced Spill Suppressor effects are most effective when applied together, in that order, after a keying effect like Keylight. Duplicate the layer containing the color screen. Magenta screens have been used for keying work in some feature films renowned for their visual effects.
After Effects Cs5 Plugin Keylight 1.2 210
Start with the highest-quality materials you can gather, such as film that you scan and digitize. The sample chapters cover basic compositing, color keying, garbage mattes, hold-out mattes, and how to avoid common problems with greenscreen shots. However, if you spend a lot of time making a perfect garbage matte that exactly effscts the subject—essentially rotoscoping—you lose the time-saving advantage of keying.
Blurring the alpha channel after keying can soften the edges of the matte, which can improve compositing results. Some keying effects—such as the Color Key effect effectx the Luma Key effect—have been superseded by more modern effects like Keylight.
If the lighting is constant, the same settings you apply to the first frame are applied to all subsequent frames.
See Parent and child layers. Use a hold-out matte to roughly protect areas that are of a similar color to the background from being keyed out. As you apply the keying effect to the layer in the foreground, the composition background or a background layer shows through, making it easy to view transparent areas.
Difference keying defines transparency with respect to a particular baseline background image. The hold-out matte is then placed directly on top of the keyed layer. After you have used a key to create transparency, use Matte effects to remove traces of key color and create clean edges. If you are not satisfied with the results, try starting again with the Linear Color Key.
If you are setting keyframes for one property only, use Linear interpolation. Make sure that the copy the hold-out matte is positioned directly on top of the keyed layer.
Introduction · After Effects Cs5 Plugin Keylight 12
A hold-out matte is a masked-out portion of a duplicate of a layer that you have keyed. Use footage with the least color subsampling possible—for example, 4: See Rotoscoping introduction and resources. Red screens are often used for shooting non-human objects, such as miniature models of cars and space ships. The Advanced Spill Suppressor effect is turned off by default to allow you to sample the key color in the Keylight effect or if the footage does not have any color spill to be removed.
The background color is then keyed out and the scene with the actor is composited over a new background. For information on the Keylight effect, see its keyliggt in the folder in which the Keylight plug-in is installed, or on the Foundry website.
Noise, grain, and other subtle variations can make css5 keying very difficult to use in practice. Aharon Rabinowitz provides a video tutorial on the Creative COW website that shows how to create a super-tight garbage matte using Auto-trace.
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