Adobe AFTER EFFECTS 7.0 Manual page 246

Set a value for either Speed or Source Frame. If you are using Source Frame, set at least two keyframes to time-
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remap the layer.
If you are using Pixel Motion as your interpolation method, adjust any of the following Tuning parameters:
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Specifies how many motion vectors are created during interpolation. The more vectors you select, the
Vector Details
longer the rendering time. A value of 100 produces one vector per pixel. If your layer has fast-moving motion, it may
look better with lower vector detail.
These options let you control the sharpness of the image:
Smoothing
•
Lets you generate the final output from the closest single frame as opposed to the closest
Build From One Image
two frames. This will result in a sharper image, but jerkier motion.
•
Correct Luminance Changes
•
Controls the quality of the filtering used to build the interpolated image.
Filtering
Note: The Extreme Filtering mode significantly increases rendering time. Since the Filtering option only affects the
sharpness of the final image, the Normal mode is recommended until you are ready for final rendering.
Specifies the accuracy of pixel matching from one frame to the next. A higher value results in fewer
Error Threshold
motion vectors and more blending.
Note: If you see edge tearing in your image, try increasing the Error Threshold for more blending. If your image has heavy
grain, try decreasing the Error Threshold so the low-level motion of the grain will be ignored.
Adjusts the size of the blocks used to calculate the vectors.
Block Size
Controls the ratio of red, green, and blue channels used in analyzing an image. Since images are analyzed
Weighting
based on brightness, changing the channel weight can affect the results. For example, setting the Red Weight and
Green Weight to zero means only the blue channel will be analyzed for motion.
To enable motion blur, select Enable Motion Blur and then adjust any of the following options:
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Specifies whether you want to adjust the shutter angle manually or have After Effects do it automat-
Shutter Control
ically.
Adjusts the intensity of motion blur. The shutter angle is measured in degrees, simulating the
Shutter Angle
exposure allowed by a rotating shutter. The shutter angle uses the footage frame rate to determine the simulated
exposure. For example, typing 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). Typing 1˚ applies almost no motion blur, and typing 720˚ applies a high degree of blur. By
default, the shutter angle is set to 180˚.
Controls the quality of the motion blur. A higher value results in a smoother motion blur.
Shutter Samples
To apply matte options, adjust any of the following:
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Specifies a layer to use as a matte for defining the foreground and background areas of an image. White
Matte Layer
areas in the matte represent the foreground, black represents the background, and gray attenuates between
foreground and background.
Specifies a color channel to use as a matte. Options are Luminance, Inverted Luminance, Alpha, and
Matte Channel
Inverted Alpha.
Allows you to apply the motion vectors from the current layers onto a layer selected for Warp Layer.
Warp Layer
Applying motion vectors from one layer to another essentially warps one image with the motion from another.
Controls the portion of the layer to be time-remapped.
Show
Lets you equalize the luminance between frames before calculating motion.
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User Guide