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Controlling change through interpolation
After you create your keyframes and motion paths, you may want to make more precise adjustments to the way the change occurs. After Effects provides several interpolation methods that affect how change occurs through and between keyframes. For example, if you are setting up motion, you can choose to make a layer change direction abruptly or smoothly through a curve. After Effects interpolates values for a change using the values of the keyframes on both ends of the change.
You can control temporal interpolation (the interpolation between keyframe values over time) for all layer properties. For layer properties that involve movement, such as Position, Anchor Point, Effect Point, and 3D Orientation, you can also control spatial interpolation (the interpolation between motion-path keyframes through space).
When you make a layer property vary over time, After Effects displays a set of related graphs specific to the property type (temporal or spatial). For temporal properties, such as Opacity, After Effects displays the interpolated values as a Value graph and the rate of change as a Velocity graph. The Value and Velocity graphs appear in the Timeline window. For spatial properties, After Effects displays the interpolated values as a motion path in the Composition or Layer window and the rate of change as a Speed graph in the Timeline window. (See Fine-tuning speed and velocity.)
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