Adobe 25510629 - After Effects CS3 Professional, Руководство пользователя

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86 How to
Keep in mind that each step in the process moves you closer to the goal of a convincing key, so
don’t try to accomplish too much with any given adjustment. After performing these steps a
few times, you’ll learn how the later steps build on the earlier ones. This sense of the whole
process will serve you well in developing a feel for how much to change each setting during
the process.
This fine-tuning process begins after you use one of the methods discussed in previous
sections to set the key. If you’re satisfied with the key, then you don’t need to proceed with the
following steps.
This procedure assumes that the color screen is green, but these steps are the same for a
bluescreen.
1.
Click the Keyer tab. If the controls are disabled, click the Input Clip layer thumbnail.
2.
Move the Transparency and Desaturation sliders all the way to the left (0.000), and move
the Spill Suppression slider all the way to the right (1.000).
3.
Increase Start Level in the Color Control area until most of the background is keyed out,
but a green halo remains around the subject. It’s okay if a little green remains elsewhere in
the background.
A) Green halo B) Green remnants