Apple Final Cut Pro 7 - Manual (Page 1096)

Using Three Keyframes
With three keyframes, you can create more complex effects, such as a curved motion
path. In the example below, the position of the clip starts at the location specified by the
first keyframe, moves to the position specified by the second keyframe, and then continues
on its journey until it reaches the position specified by the third keyframe. (For more
information about creating motion paths in the Canvas, see
“Creating Keyframed Motion
Paths in the Canvas.” )
Keyframe 2
Keyframe 1
Keyframe 3
Using Four or More Keyframes for Complex Effects
You can make isolated changes to sections of an overlay for an effect if you have at least
four keyframes. For example, if you have a superimposed clip that’s set at 50 percent
opacity for the duration of the clip, but you need it to go to 100 percent for 3 seconds
right in the middle, you can create four keyframes on that clip’s opacity overlay. Now you
can have the opacity level of the clip start at 50 percent, jump to 100 percent for the
duration the keyframes specify, and then drop back to 50 percent for the remaining
duration of the clip.
Using four keyframes, you
can isolate changes to specific
sections of a clip’s overlay.
1096 Chapter 67 Adjusting Parameters for Keyframed Effects