Adobe After Effects CS4 - Manual (Page 608)

602 USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
Block Size Adjusts the size of the blocks used to calculate the vectors.
Weighting Controls the weighting of the red, green, and blue channels in calculations used to analyze the image. For
example, setting Red Weight and Green Weight to zero means that only the blue channel is analyzed for motion.
Motion Blur controls
Shutter Angle Determines the intensity of motion blur. The shutter angle is measured in degrees, simulating the
exposure caused by a rotating shutter. Simulated exposure time is determined by dividing the shutter angle by the
frame rate times 360°. For example, a shutter angle of 90° causes an exposure of 1/96 of a second per frame: 90° / (360°
* 24 fps).
Shutter Samples Controls the quality of the motion blur. A higher value results in a smoother motion blur.
Matte, warp, and crop controls
Matte Layer The layer to use as a matte for defining the foreground and background areas of the image. White areas
in the matte represent the foreground, black areas represent the background, and gray attenuates between foreground
and background.
Matte Channel The channel to use as a matte.
Warp Layer Allows you to warp the layer to which the effect is applied by applying the motion vectors from the layer
that you choose.
Show Controls the portion of the layer to be time-remapped.
Source Crops If the image contains unwanted pixels or artifacts at the edges, use Source Crops controls to specify
image boundaries. Pixels from the boundaries are repeated to fill the area beyond the boundaries to the edges of the
layer.
More Help topics
“ Composition settings ” on page 58
“ Render settings ” on page 697
Transition effects
For an example of how to use animation presets to create custom transitions, see this entry in Stu Maschwitz’s ProLost
blog. From this page, you can download the Film Burn animation preset, which adds film-like flicker to layers and adds
a film burn transition to the ends of the durations of layers.
Chris Zwar provides an example project on his website that uses the Displacement Map effect, the Turbulent Displace
effect, the Texturize effect, and a combination of Blur and Color Correction effects to create a transition in which an
image appears as a watercolor image washed onto a rough piece of paper.
Carl Larsen provides a tutorial on the Creative COW website that shows how to use the Motion Tile effect to create a
whip-pan transition between two layers.
About Transition effects and the Transition Completion property
All Transition effects but the Iris Wipe effect have a Transition Completion property. When this property is 100%, the
transition is complete, and the underlying layers show through; the layer to which the effect is applied is entirely
transparent. You typically animate this property from 0% to 100% over the time of the transition.