Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 538

Timewarp effect
Method options
These options determine how interpolated frames are generated:
Duplicates the last frame shown.
Whole Frames
Creates a new frame by blending existing frames.
Frame Mix
Creates a new frame by analyzing the pixel movement in nearby frames and creating motion vectors.
Pixel Motion
Adjust Time By controls
Choose Speed to specify a time adjustment as a percentage. Choose Source Frame to specify a time adjustment by
identifying which source frame is to play at which time. If you choose Source Frame for Adjust Time By, then you
must animate the Source Frame property to do anything other than freeze on one frame.
Tuning controls for Pixel Motion interpolation
Determines how many motion vectors are used during interpolation. The more vectors used, the
Vector Details
longer the rendering time. A value of 100 produces one vector per pixel. If the layer has fast-moving motion, it may
look better with a lower Vector Details setting.
These controls affect the sharpness of the image:
Smoothing
•
Build From One Image
frames. The result is a sharper image, but jerkier motion.
•
Correct Luminance Changes
• The quality of the filtering used to build the interpolated image. Extreme greatly increases rendering
Filtering
time. The Filtering option affects only the sharpness of the final image; use Normal until you're ready for final
rendering.
Determines the precision of pixel matching from one frame to the next. A higher value results in
Error Threshold
fewer motion vectors and more blending.
Note: If you see edge tearing in the image, try increasing the Error Threshold for more blending. If the image has heavy
grain, try decreasing the Error Threshold so the low-level motion of the grain is ignored.
Adjusts the size of the blocks used to calculate the vectors.
Block Size
Controls the weighting of the red, green, and blue channels in calculations used to analyze the image. For
Weighting
example, setting Red Weight and Green Weight to zero means that only the blue channel is analyzed for motion.
Motion Blur controls
Determines the intensity of motion blur. The shutter angle is measured in degrees, simulating the
Shutter Angle
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).
Generates the final output from the closest single frame, as opposed to the closest two
Equalizes the luminance between frames before calculating motion.
AFTER EFFECTS CS3 532
User Guide