Adobe 65008009 - After Effects CS4 Using Manual page 487

Last updated 12/21/2009
4 Position the boundary mask to specify the area of the image that will remain unaltered. Areas within the boundary
mask are distorted; areas outside the mask remain unaltered. Keep the boundary mask as far as possible from the
source and destination masks to avoid foldovers.
Scale and position the source mask over the image.
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6 Scale and position the destination mask to indicate the final shape. Distortions work best if the source and
destination masks are in approximately the same location.
Make the Composition or Timeline panel active, select the layer, and then choose Effect > Distort > Reshape.
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8 From the Mask menus, choose the source, destination, and boundary masks.
Adjust the Percent control, and choose an option for Elasticity.
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In the Composition panel, add, delete, or move correspondence points on the masks to control the distortion:
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• To add a point, Alt-click (Windows) or Option-click (Mac OS) the mask.
• To delete a point, Alt-click or Option-click the point.
• To move a point, drag it to a new location.
• To change the interpolation of a pair of points, Shift-click a point. Smooth interpolation works best with round
masks, while linear interpolation works best with angular masks. You can combine smooth and linear interpolation
in the same composition.
11 Choose an interpolation method, and preview the distortion. If Linear or Smooth produces undesired results, add
more keyframes. If Discrete produces undesired results, choose another method.
Ripple effect
The Ripple effect creates the appearance of ripples in a specified layer, moving away from a center point in concentric
circles. The effect is similar to dropping a stone in a pond. You can also specify that ripples move toward the center
point.
Animate ripples at a constant speed using the Wave Speed control. This control doesn't require keyframes for
animation. Animate ripples at varying speeds by creating keyframes for the Ripple Phase control.
This effect works with 8-bpc and 16-bpc color.
Controls the distance the ripples travel from the center point. The Radius value is a percentage of the image
Radius
size. If the center of the ripple is the center of the layer and the radius is set to 100, the ripples travel to the edge of the
image. A value of 0 produces no ripples. Like ripples in water, ripples in the layer become smaller as they travel farther
from the center.
To create a single-wave ripple, set Radius to 100, Wave Width to a value in the range from 90 to 100, and Wave Height
as desired.
Specifies the center of the effect.
Center Of Ripple
Specifies how the ripples are created. Asymmetric produces more realistic-looking ripples;
Type Of Conversion
asymmetric ripples include lateral motion and produce more distortion. Symmetric produces motion that travels only
outward from the center point; symmetric ripples produce less distortion.
Sets the speed at which the ripples travel outward from the center point. When you specify a wave speed,
Wave Speed
the ripples are automatically animated at a constant speed (without keyframes) across the time range. A negative value
makes the ripples move toward the center, and a value of 0 produces no movement. To vary wave speed over time, set
this control to 0, and then create a keyframe for the Ripple Phase property of the layer.
USING AFTER EFFECTS CS4
Effects and animation presets
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