Adobe AFTER EFFECTS 5.5 Help Manual page 132

Adobe After Effects Help
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Value difference The difference between the values of adjacent keyframes. A large
difference between keyframe values, such as the difference between 75% and 20%
opacity, creates a faster rate of change than a smaller difference, such as the difference
between 30% and 20% opacity. Use value differences to adjust the rate of change by
increasing or decreasing the value of a layer property at a keyframe.
Larger difference (left) creates faster change. Smaller difference (right) creates slower change.
Interpolation type The type of interpolation applied for a keyframe. For example, it is
difficult to make a value change smoothly through a keyframe when the keyframe is set
to Linear interpolation; but at any time, you can switch to Bezier interpolation, which
provides a smooth change through a keyframe. If you use Bezier interpolation, you can
adjust the rate of change even more precisely using ease handles. For more information,
see "Fine-tuning speed" on page 134.
Controlling speed along a motion path
When you animate a spatial property such as Position, Anchor Point, Effect Point, 3D
Orientation, or Mask Shape, you can view and adjust the speed of the layer in the Speed
graph in the Timeline window or on the motion path in the Composition or Layer window.
As you adjust the speed in one window, you can view the changes in the other window. In
the Timeline window's Speed graph, change in the graph height indicates changes in
speed. Level values indicate constant speed; higher values indicate increased speed.
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Fine-tuning Animation
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