Adobe Premiere Pro CS4 - Manual (Page 301)

295 USING ADOBE PREMIERE PRO CS4
Effects and transitions
Last updated 11/6/2011
2 Ctrl-click (Windows) or Command-click (Mac OS) on the rubber band to create a speed keyframe .
3 Ctrl-drag (Windows) or Command-drag (Mac OS) a speed keyframe (both halves) to the place where you want the
backward motion to end. A tool tip shows the speed as a negative percentage of the original speed. The Program
monitor displays two panes: the static frame where you initiated the drag, and a dynamically updating frame that
reverse playback returns to before switching to forward speed. When you release the mouse button to end the drag,
an additional segment is added for the forward playback portion. The new segment has the same duration as the
segment you created. An additional speed keyframe is placed at the end of this second segment. Left-pointing angle
brackets
appear in the speed-control track, indicating the section of the clip playing in reverse.
The segment plays backward at full speed from the first keyframe to the second. Then, it plays forward at full speed
from the second to the third keyframe. Finally, it returns to the frame at which the backward motion began. This effect
is called a palindrome reverse.
You can create a segment that plays in reverse and doesn't return to forward playback. Use the Razor tool or the Trim
tool to remove the segment of the clip with the forward playback section.
Keyframes, left-pointing angle brackets, and rubber band in a palindrome reverse
4 (Optional) You can create a speed transition for any part of the change in direction. Drag the right half of a speed
keyframe to the right, or the left half to the left.
A gray area appears between the halves of the speed keyframe, indicating the length of the speed transition. The rubber
band forms a ramp between the two halves, indicating a gradual change in speed occurring between them. A blue curve
control appears in the gray area.
Blue curve control in gray area between the halves of a speed keyframe
5 (Optional) To change the acceleration or deceleration of any part of the directional change, drag either of the
handles on the curve control.
The change of speed eases in or eases out according to the curvature of the speed ramp.