Adobe After Effects - Manual (Page 255)

Note:
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1. Display the speed graph for the keyframe you want to adjust.
2. Select the keyframe you want to edit, and then choose Animation > Keyframe Velocity.
3. Enter values for Speed for Incoming and Outgoing Velocity.
4. Enter a value for Influence to specify the amount of influence toward the previous keyframe (for incoming interpolation) or the next keyframe
(for outgoing interpolation).
5. To create a smooth transition by maintaining equal incoming and outgoing velocities, select Continuous.
By default, the proportions of the current Scale or Mask Feather values are preserved as you edit the values. If you don’t want to preserve
proportions, click the link icon next to the property values in the Timeline panel to remove the icon.
Automatically ease speed
Although you can manually adjust the speed of a keyframe by dragging direction handles, using Easy Ease automates the work.
After you apply Easy Ease, each keyframe has a speed of 0 with an influence of 33.33% on either side. When you ease the speed of an object,
for example, the object slows down as it approaches a keyframe, and gradually accelerates as it leaves. You can ease speed when coming into or
out of a keyframe, or both.
1. In the Graph Editor or in layer bar mode, select a range of keyframes.
2. Do one of the following:
Choose Animation > Keyframe Assistant > Easy Ease (to ease speed coming both into and out of selected keyframes), Easy Ease In (to
ease speed coming into selected keyframes), or Easy Ease Out (to ease speed coming out of selected keyframes).
Click the Easy Ease , Easy Ease In , or Easy Ease Out button located at the bottom of the Graph Editor.
Smooth motion with roving keyframes
Using roving keyframes, you can easily create smooth movement across several keyframes at once. Roving keyframes are keyframes that are not
linked to a specific time; their speed and timing are determined by adjacent keyframes. When you change the position of a keyframe adjacent to a
roving keyframe in a motion path, the timing of the roving keyframe may change.
Roving keyframes are available only for spatial layer properties, such as Position, Anchor Point, and effect control points. In addition, a keyframe
can rove only if it is not the first or last keyframe in a layer, because a roving keyframe must interpolate its speed from the previous and next
keyframes.
The original motion path (top) shows different velocities between keyframes. After the keyframes are set to rove (bottom), the motion path shows
consistent speed over the range of keyframes.
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