About the alpha transition controls – Apple Final Cut Pro 7 User Manual
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Control-click the transition, then choose Open from the shortcut menu.
About the Alpha Transition Controls
Use the following controls to create and modify the alpha transition in the Transition
Editor window. For more information about the Transition Editor, see
“Clip” clip well
Clip Alpha Matte clip well
Wipe Matte clip well
Opacity slider and field
Mid-point Offset slider
and field
Scale Transition Asset
Durations checkbox
Reverse Transition Assets
checkbox
• “Clip” clip well: This is where you place the main element clip that wipes across the
screen revealing the next scene underneath it. This clip may or may not contain a
straight alpha channel.
• Clip Alpha Matte clip well: If the element clip that you dropped into the “Clip” clip well
does not contain an alpha channel, you can drop a clip into this clip well to create an
alpha channel from its luma values.
• Wipe Matte clip well: The actual wipe animation between the two clips in the Timeline
is determined by the luma values of the clip dropped into this clip well. Any white areas
in this clip will display the first clip. Any black areas in this clip will display the second
clip. Any levels of gray will display the appropriate mix of the two clips. The wipe
generated by this clip well is generally invisible to the viewer because it happens
underneath the main element clip. However, if you place a clip in this well only, you
can create a luma-based wipe.
• Scale Transition Asset Durations checkbox: Select this checkbox to scale the duration of
the media in the clip wells to fit the duration of the transition in the Timeline.
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Chapter 47
Adding Transitions