Apple Final Cut Pro 5 - Manual (Page 1038)

Chapter 13 Adjusting Parameters for Keyframed Effects 251
II
Adding additional keyframes increases the complexity of the effect, but the area in
between each pair of keyframes in your clip is still smoothly interpolated.
Determining the Number of Keyframes to Use
The complexity of the changes in your effects depends on the number of keyframes
that you add to a clip. You need at least two keyframes in a clip to make a dynamic
change from one value in an effects parameter to another. A more sophisticated
change requires three keyframes. To isolate a keyframe change to a certain section of
the entire overlay for an effect, you need at least four keyframes.
Creating Simple Effects With Two Keyframes
The simplest thing you can do to make a change is to add two keyframes. For example,
you can change the size, or scale, of a clip by adjusting its scale from 25 percent in the
first keyframe to 75 percent in the second keyframe.
First
keyframe
Overlay in the Timeline for
the Opacity parameter Second
keyframe
Using more keyframes
creates additional
complexity, shown
in the overlay.
Two keyframes let you
create a basic change.