Adobe 65021048 User Guide - Page 297

ADOBE PREMIERE PRO CS3 291 User Guide 6 Do any combination of the following: • Drag a keyframe or segment up or down to change the value. As you drag, a tool tip indicates the current value. If no keyframes are present, dragging adjusts the value for the entire clip or track. • Drag a keyframe left or right to change the time location of the keyframe. As you drag, a tool tip indicates the current time. If you move a keyframe onto another keyframe, the new keyframe replaces the old one. The Value and Velocity graphs in the Effect Controls panel will show changes made to keyframes in the Timeline panel. Editing keyframe values in the Timeline panel You can use the Selection and Pen tools to edit keyframes in the Timeline panel. You increase or decrease values by dragging keyframes vertically. When working with keyframes graphically in the Timeline panel, be aware of how the values and units of specific properties are represented along the vertical axis of the time graph, as in the following examples: • Opacity is measured from 0% at the bottom of the scale to 100% at the top of the scale, and the center of the graph is 50%. • Rotation is measured in rotations and degrees, and the center of the graph represents no rotation (0°). Clockwise rotation values are above the center, and counterclockwise values are below the center. • Audio balance is measured from -100 to 100, with 0 at the center (neutral balance). Dragging above the center moves balance toward the left channel and sets a negative value, and dragging below the center moves balance toward the right channel and sets a positive value. Optimize keyframe automation Automating audio changes in the Audio Mixer can create more keyframes than necessary in the audio track, causing a degradation in performance. To avoid creating unnecessary keyframes, thereby ensuring both quality interpretation and minimal performance degradation, set the Automation Keyframe Optimization preference. In addition to the other benefits, you can edit individual keyframes much easier if they are assembled less densely in the track. 1 Choose Edit > Preferences > Audio (Windows) or Premiere Pro > Preferences > Audio (Mac OS). 2 In the Automation Keyframe Optimization area, select one or both of the following options, and then click OK: Linear Keyframe Thinning Creates keyframes only at points that do not have a linear relationship to the start and end keyframes. For example, suppose you are automating a fade from 0 dB to -12 dB. With this option selected, Adobe Premiere Pro only creates keyframes at the points that represent an increase in value from the beginning (0 dB) and ending (-12 dB) keyframes. If you do not select this option, Adobe Premiere Pro may create several incremental keyframes of identical values between those two points, depending on the speed at which you change the value. This option is selected by default. Minimum Time Interval Thinning Creates keyframes only at intervals larger than the value that you specify. Enter a value between 1 and 2000 milliseconds. See also "About recording audio changes" on page 206 April 1, 2008