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If a curve segment has a left control point that’s higher than the right control point, then
the motion will be reversed and that segment will play backward.
A Retime Frame curve with an inverted curve that creates reverse motion
The Retime Speed curve (seen below) exposes a flat line that represents 100% speed.
Adding pairs of control points and dragging each segment to raise or lower it alters
speed; you must drag the segments, not the control points themselves. Raising a curve
segment shortens that segment and speeds up that portion of the clip, while lowering a
curve segment lengthens that segment and slows down that portion of the clip. Asyou
adjust each curve segment, a tooltip shows you the exact speed percentage that
segment represents. You should note that it’s impossible to create reverse motion using
the Retime Position curve; you need to use either the Retime controls or the Retime
Speed curve described above.
A Retime Speed curve with two segments: a shorter one that
creates fast motion, and a longer segment that creates slow motion
Methods of working with speed curves:
To expose speed curves for a clip in the Timeline: Right-click a clip in the Timeline,
and choose Retime Curve. The Curve Editor is exposed for that clip, and you can edit it
as you would any other curve, adding moving, and deleting control points.
Chapter – 42 Speed Effects 843