Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 542

AFTER EFFECTS CS3 536
User Guide
configuration, the image may look unusual (strangely sheared, for example). But if you know the focal length that
you are trying to match, this control is the easiest way to get correct results.
Jitter controls
Adding jitter (Position Jitter and Rotation Jitter) makes this transition more realistic. Jitter works on the cards before,
during, and after the transition occurs. If you want the jitter to happen only during the transition, start with the Jitter
Amount at 0, animate it up to the desired amount during the transition, and then animate it back down to 0 at the
completion of the transition.
Specifies the amount and speed of jitter at the x, y, and z axes. X, Y, and Z Jitter Amount specify the
Position Jitter
amount of extraneous movement. The X, Y, and Z Jitter Speed values specify the speed of jitter for each Jitter Amount
option.
Specifies the amount and speed of rotation jitter around the x, y, and z axes. X, Y, and Z Rotation Jitter
Rotation Jitter
Amount specify the amount of rotational jitter along an axis. A value of 90˚ makes it possible for a card to rotate up
to 90˚ in either direction. The X, Y, and Z Rot Jitter Speed values specify the speed of rotational jitter.
Gradient Wipe effect
The Gradient Wipe effect causes pixels in the layer to become transparent based on the luminance values of corre-
sponding pixels in another layer, called the gradient layer. Dark pixels in the gradient layer cause the corresponding
pixels to become transparent at a lower Transition Completion value. For example, a simple grayscale gradient layer
that goes from black on the left to white on the right causes the underlying layer to be revealed from left to right as
Transition Completion increases.
This effect works with 8-bpc and 16-bpc color.
Original (top left), and with effect applied (bottom left and right)
The gradient layer can be a still image or a moving image. The gradient layer must be in the same composition as the
layer to which you apply Gradient Wipe.
You can create gradient layers in many ways, such as using the Ramp effect or creating them in Photoshop or
Illustrator.
The degree to which the transition is gradual for each pixel. If this value is 0%, pixels in the layer
Transition Softness
to which the effect is applied are either completely opaque or completely transparent. If this value is greater than 0%,
pixels are semitransparent at the intermediate stages of the transition.