Adobe AFTER EFFECTS 5.5 Help Manual page 91

Adobe After Effects Help
Using Help | Contents
Adjusting the shutter angle for motion blur
Adjust the intensity of motion blur by changing the shutter angle setting. The shutter
angle is measured in degrees, simulating the exposure allowed by a rotating shutter. If you
are not applying motion blur, shutter angle has no effect.
The shutter angle uses the footage frame rate to determine the simulated exposure. For
example, typing 90 degrees (12.5% of 720 degrees) for 24-fps footage creates an effective
exposure of / of a second (25% of
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motion blur, and typing 720 degrees applies a high degree of blur. By default, the shutter
angle is set to 180 degrees.
To set the shutter angle and phase for motion blur:
1 Choose Composition > Composition Settings.
2 On the Advanced tab, type a value for Shutter Angle.
3 In Shutter Phase, type a number (up to 360) for when you want the shutter to open
relative to the frame start (optional) and click OK.
Note: You can also change the shutter angle for a composition in the Render Queue
window. See "Changing render settings" on page 281.
Using audio layers
In After Effects, you can change volume levels of audio layers, preview them at a specified
quality, and identify and mark locations. An audio layer contains different properties than
a video layer, but you modify them the same way. You can apply special audio effects to
audio layers, and adjust the waveform values.
For information about using markers with audio, see "Adding markers synchronized to
audio" on page 86.
Previewing audio
When you preview audio, you control the quality and length of the preview. The audio
preview preferences you set do not affect rendering; the quality or audio in rendered
video is determined by the output module setting. See "Changing output module
settings" on page 284.
While previewing audio, After Effects displays clipping signals that indicate when the
audio is clipping. Clipping is a distortion that occurs when the audio signal exceeds the
maximum level that the audio device allows.
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/ of a second). Typing 1 degree applies almost no
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Managing Layers
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