Adobe AFTER EFFECTS 5.5 Help Manual page 139

Adobe After Effects Help
Using Help | Contents
Select the keyframes you want to change and choose Animation > Keyframe Interpo-
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lation. Then choose Lock to Time from the Roving pop-up menu.
Automatically easing speed using the Easy Ease keyframe
assistant
Eliminate sudden changes in a property's speed using the Easy Ease keyframe assistant.
Although you can manually adjust the speed of a keyframe by dragging ease 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 only
when coming into or out of a keyframe, or both.
To ease speed:
1 In the Timeline window, select a range of keyframes.
2 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).
Time-stretching a layer
Using the Time Stretch command, you can easily change how fast or slow a layer
containing either audio or video is played back. Speeding up or slowing down a layer is
also known as time-stretching. When you time-stretch a layer, the audio file or the original
frames in the footage (and all keyframes that belong to the layer) are redistributed along
the new duration. Use this command only when you want the layer and all layer keyframes
to change to the new duration.
Time-stretching a layer redistributes keyframes along the new duration.
If you time-stretch a layer so that the resulting frame rate is significantly different from the
original speed, the quality of motion within the layer may suffer. Turn on frame blending
to improve slow-motion or fast-motion effects. See "Enhancing time-altered motion by
blending frames" on page 89.
To time-stretch a layer from a specific time:
1 In the Timeline or Composition window, select the layer.
2 Choose Layer > Time Stretch.
3 Type a new duration for the layer, or type a Stretch Factor.
4 Click one of the Hold in Place options to specify the point in time from which the layer
will be time-stretched, and then click OK:
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Fine-tuning Animation
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