Adobe 65021048 User Guide - Page 300

ADOBE PREMIERE PRO CS3 294 User Guide 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 animations. 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. A B C 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 interpolation 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. April 1, 2008