User Guide

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ADOBE GOLIVE CS2
User Guide
QuickTime transition effects for two-source filters
When you set transition effects for two-source filters, you can set the following alpha-channel-based effects in the
Select Effect dialog box:
Alpha Compositor Combines two images using the alpha channels of the images to control the blending. It provides
for the standard alpha blending options, and can handle pre-multiplying by any color, although white and black are
the most common and often run faster. The alpha compositor effect has one parameter, Blend mode, that can contain
one of the following values:
• Straight Alpha Performs a standard alpha blend. The alpha channel value of the first track defines the amount of
that track that is included in the composite image. One minus the alpha channel value of the first track defines the
amount of the second track that is included in the composite image.
• Pre-multiply Alpha Calculates the destination pixel based on the color you specify in the Pre-multiply color field.
• Reverse Alpha Performs a reverse alpha blend.
Chroma Key Combines two tracks by replacing all the first track’s pixels (specified in the Key Color field) with the
corresponding pixels of the second track. This effect reveals the second track below the first in those places where
the first track has the specified color. The Key Color is the chroma key color to replace in the first track with pixels
from the second track.
The following effects are transitions between two tracks:
Cross Fade Also called a dissolve, this effect provides a smooth alpha blending between two video sources, which
results in a smooth fade out from the first track into the second. This effect has one parameter—Percentage. The two
slider controls let you manipulate the degree of visibility of either source during the blend.
Explode In an Explode effect, track B grows from a single point; expanding out until it entirely covers track A. This
effect has three parameters:
• Percentage Specifies the degree of visibility of either source during the blend.
• Explode Center X Specifies the x-coordinate (horizontal) of the explosion center.
• Explode Center Y Specifies the y-coordinate (vertical) of the explosion center.
Gradient Wipe Transitions between two tracks, with the change pattern controlled by an input image. At the start
of theeffect, theareacovered by theinput imageshows thefirst track, whilethe area outsidethe inputimage shows
the second. Over the duration of the effect, the input image shrinks until only the second track is visible. The
Gradient wipe effect has three parameters:
• Percentage Specifies the degree of visibility of either source during the blend.
• Matte Specifies the input image that controls the transition between the two tracks.
• Edge Blur Controls the amount of edge blur, or distortion, that the leading edge of the gradient wipe displays.
Implode Shrinks track A down to a single point, revealing track B. The center point of the implosion is defined in
the effect parameters. The Implode effect has three parameters:
• Percentage Specifies the degree of visibility of either source during the blend.
• Implode Center X Specifies the x-coordinate (horizontal) of the implosion center.
• Implode Center Y Specifies the y-coordinate (vertical) of the implosion center.