Adobe Premiere Pro CS3 - Manual (Page 300)

ADOBE PREMIERE PRO CS3
User Guide
294
The two most common types of interpolation are linear interpolation and Bezier interpolation.
Linear interpolation Creates an evenly-paced change from one keyframe to another, with each in-between frame
given an equal share of the changed value. Changes created with linear interpolation start and stop abruptly and
develop at a constant rate between each pair of keyframes.
Bezier interpolation Allows the rate of change to accelerate or decelerate based on the shape of a Bezier curve, such
as gently picking up speed at the first keyframe and then slowly decelerating into the second.
Change a keyframe’s interpolation method
By changing and adjusting keyframe interpolation, you gain precise control over the rate of changes in your anima-
tions. You can choose either an interpolation type from a context menu or you can directly change one keyframe
type to another by manually adjusting the keyframe or the handles.
Note: You can also use the Ease In and Ease Out commands to quickly adjust keyframe interpolation.
Changing keyframe interpolation for the Position parameter of the Motion effect
A Linear spatial keyframe B. Auto Bezier interpolation C. Continuous Bezier interpolation
1 Do one of the following:
• In the Effect Controls panel, right-click a keyframe marker.
• In the Timeline panel, right-click a keyframe.
2 Choose an interpolation method from the context menu:
Linear Creates a uniform rate of change between keyframes.
Bezier Lets you manually adjust the shape of the graph, and the rate of change, on either side of a keyframe. You
can create very smooth changes using this method.
Auto Bezier Creates a smooth rate of change through a keyframe. As you change a keyframe’s value, the Auto Bezier
direction handles change to maintain a smooth transition between keyframes.
Continuous Bezier Creates a smooth rate of change through a keyframe. However, unlike the Auto Bezier interpo-
lation method, Continuous Bezier lets you adjust direction handles manually. As you change the shape of a graph
on one side of a keyframe, the shape on the other side of the keyframe changes to maintain a smooth transition.
Hold Changes a property value without gradual transition (sudden effect changes). The graph following a keyframe
with the Hold interpolation applied appears as a horizontal straight line.
Ease In Slows down the value changes entering a keyframe.
Ease Out Gradually accelerates the value changes leaving a keyframe.
Note: Although interpolation methods can vary the rate at which a property changes between keyframes, they cannot
change the actual duration between keyframes. Duration is determined by the time (or distance in the time ruler)
between keyframes.
A B C
April 1, 2008