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Using Keyframes

Whenever you create motion paths, change filters over time, sculpt audio levels, or just fade to black, you need to use keyframes. Think of a keyframe as a kind of edit point: you set a keyframe at the point at which you want to change the value of an effect's parameter. Keyframes work the same way wherever they are applied.

When you use a keyframe to change a parameter, you have the option of making that keyframe a “curve-type.” Curve-type keyframes have two added controls: Bézier handles, which you can use to fine-tune the shape of the motion path's curve, and ease handles, which you can use to fine-tune a clip's speed immediately before and after the keyframe location. You can also use curve-type keyframes to fine-tune the rate of change in an effect parameter's level. Converting a keyframe from a “corner type” to a “curve-type” is sometimes called smoothing a keyframe. For more information on keyframe types, see “Adjusting motion path curves and corners,” later in this chapter.


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