Adobe AFTER EFFECTS 7.0 - Smoothing Motion and Velocity; To Apply Motion Blur to a Layer; To Set the Shutter Angle and Phase for Motion Blur

ADOBE AFTER EFFECTS 7.0
User Guide
215
See also
“Frame blending” on page 238
To apply motion blur to a layer
TheMotionBlurswitch createsatruemotionblurbasedonthelayer’smovementinacompositionandwhatyou
specify for the shutter angle and phase.
Motion Blur slows previewing and rendering, but you can apply motion blur without displaying it in the Compo-
sition panel. Use the Enable Motion Blur button near the top of the Timeline panel to control whether layers that
use motion blur affect redraw and rendering. You can also enable motion blur for all compositions when you render
a movie.
❖ Select the layer or composition you want to blur in the Timeline panel, and choose Layer > Switches > Motion
Blur.
You can also apply motion blur by clicking the Motion Blur switch for that layer.
Note: A check mark next to the Motion Blur command in the Layer > Switches menu indicates that motion blurring is
turnedonfortheselectedlayerorcomposition.Aniconalso appears in the Motion Blur switch column for that layer
in the Timeline panel.
See also
“To set the shutter angle and phase for motion blur” on page 215
“To change render settings” on page 604
To set the shutter angle and phase for motion blur
You can adjust the intensity of motion blur by changing the 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, entering 90˚ (25%
of 360˚) for 24-fps footage creates an effective exposure of 1/96 of a second (25% of 1/24 of a second). Entering 1˚
applies almost no motion blur, and entering 720˚ applies a high degree of blur. By default, the shutter angle is set to
180˚.
1 Choose Composition > Composition Settings.
2 In the Advanced tab, type a value for Shutter Angle.
3 For Shutter Phase, type a number (up to 360) specifying when you want the shutter to open relative to the frame
start, and then click OK.
Note: You can also change the shutter angle for a composition in the Render Queue panel. (See “To change render
settings” on page 604.)
Smoothing motion and velocity
Smooth motion paths, value curves, and velocity curves to eliminate bumpiness or excess keyframes using The
Smoother, which adds keyframes or removes unnecessary keyframes. You can also use the Smooth expression to
accomplish this.
Although you can smooth a curve for any property, The Smoother is most useful when applied to curves that have
been automatically generated by Motion Sketch, where you may have excess keyframes. Applying The Smoother to
keyframes that have been set manually may result in unexpected changes to the curve.