Apple Final Cut Pro 7 - Manual (Page 1114)

Understanding Bezier Handles and Curves
When adjusting the Bezier handles that are attached to a smoothed clip, there are several
kinds of curves you can create, which result in different velocity rates.
• The steeper the curve of the Bezier handles in the parameter’s keyframe graph line (or
overlay), the faster the rate of change.
• The shallower the curve of the parameter’s keyframe graph line (or overlay), the slower
the rate of change.
Constant rate of change
Shallow rate of change
Steep rate of change
The kinds of curves you can apply to a keyframe depend on that keyframe’s location
relative to other keyframes on the parameter’s keyframe graph line.
One-Sided Bezier Handles
The first and last keyframes of a group have one-sided Bezier handles. These keyframes
begin and end any dynamic changes in a clip’s parameters, and therefore they accelerate
into a change and decelerate out of it.
Bezier handle First keyframe
Last keyframe
Bezier handle
1114 Chapter 67 Adjusting Parameters for Keyframed Effects