Adobe After Effects CS3 Bedienungsanleitung PDF herunterladen (Seite 544)

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AFTER EFFECTS CS3

User Guide

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Corner Pins controls

CornerPinningisanalternativecameracontrolsystem.Useitasanaidforcompositingtheresultoftheeffectinto

a scene on a flat surface that is tilted with respect to the frame.

Upper Left Corner, Upper Right Corner, Lower Left Corner, Lower Right Corner Where to attach each of the corners

of the layer.

Auto Focal Length Controls the perspective of the effect during the animation. If Auto Focal Length is unselected,

thefocallengthyouspecifyisusedtofindacamerapositionandorientationthatpositionsthecornersofthelayer

at the corner pins, if possible. If not, the layer is replaced by its outline, drawn between the pins. If Auto Focal Length

is selected, the focal length required to match the corner points is used, if possible. If not, it interpolates the correct

value from nearby frames.

Focal Length Overrides the other settings if the results you’ve obtained aren’t what you need. If you set the Focal

Length to something that doesn’t correspond to what the focal length would be if the pins were actually in that

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.

Position Jitter Specifies the amount and speed of jitter at the x, y, and z axes. X, Y, and Z Jitter Amount specify the

amountofextraneousmovement.TheX,Y,andZJitterSpeedvaluesspecifythespeedofjitterforeachJitterAmount

option.

Rotation Jitter Specifies the amount and speed of rotation jitter around the x, y, and z axes. X, Y, and Z 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

thatgoesfromblackonthelefttowhiteontherightcausestheunderlyinglayertoberevealedfromlefttorightas

Transition Completion increases.

This effect works with 8-bpc and 16-bpc color.

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