Apple Final Cut Express HD - Manual (Page 529)

Chapter 36 Refining Transitions Using the Transition Editor 529
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Dragging the transition bar from the middle results in a roll edit, which moves the edit
point between two clips in a sequence. Dragging either of the transition edges
shortens or extends the transition.
Note: A roll edit adjusts the location of an edit point shared by two clips; the Out point
of the first clip and the In point of the second clip are moved simultaneously, or rolled.
This changes the location of the edit point in the sequence, as well as the duration of
each clip. For more information, see “
Using the Roll Tool to Change Where a Cut
Occurs ” on page 470.
Start and End Percentages of Transition
These sliders allow you to set the starting and ending percentages of the transition’s
visual effect. For example, if you are using an edge wipe, the default starting
percentage of 0 percent places the border of the wipe all the way to the left of the
image, essentially revealing all of the outgoing clip.
Halfway through the wipe, at the edit point, the wipe is at 50 percent, placing the
border of the wipe in the middle of the picture. You can now see half of the incoming
clip to the left and half of the outgoing clip to the right.
At the end of the edit, with the transition finished and the default ending percentage
of 100%, the border of the wipe is all the way to the right, revealing the entire
incoming clip.
Reverse Transition Button
Some transition effects have a default direction. For example, a wipe goes from the left
to the right, a clock wipe’s border travels in a clockwise direction, and the spin 3D
transition spins the outgoing clip out to the right.
To reverse the direction of an effect, click the Reverse Transition button. If you reverse
the direction for the above examples, the wipe moves from right to left, the clock wipe
moves in a counter-clockwise direction, and the spin 3D transition spins the incoming
clip in to the left.
Reverse Transition button