Interpolation - Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual

Set Frequency to specify how many deviations (keyframes) per second After Effects adds to the selected
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keyframes. A low value produces only occasional deviations, while a high value produces more erratic results. A
value between 0 and 1 creates keyframes at intervals of less than one per second. For example, a value of 0.5 creates
one keyframe every 2 seconds.
Set Magnitude to specify the maximum size of the deviations. After Effects sets the specified magnitude to the
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units of the selected property, so a value for one property may produce very different results in another property.
8 Click Apply and preview the results.
If necessary, choose Edit > Undo The Wiggler to reset the keyframes, adjust the values for Frequency and
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Magnitude, and then reapply The Wiggler.
See also
"Select keyframes" on page 190
Convert audio to keyframes
The Convert Audio To Keyframes keyframe assistant analyzes audio amplitude within the work area and creates
keyframes for audio amplitude. This keyframe assistant creates a new Audio Amplitude layer representing all audio
sources in the composition, with three Expression Controls effects with Slider properties that contain the keyframes:
Left Channel, Right Channel, and Both Channels.
To make use of the keyframes created by this keyframe assistant, you must link the changes in audio amplitude to
other layer properties. For example, use an expression to link the audio keyframes to the Scale property of a layer to
make the layer grow and shrink as the amplitude increases and decreases.
❖
Select the Timeline panel, and then choose Animation > Keyframe Assistant > Convert Audio To Keyframes.
See also
"Expressions" on page 543
"Set the work area" on page 116

Interpolation

Controlling change with interpolation
After you create keyframes and motion paths to change values over time, you may want to make more precise adjust-
ments to the way that 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.
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User Guide