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Chapter 14. Motion Settings > Creating Acceleration or Deceleration

Creating Acceleration or Deceleration

Ordinarily, motion proceeds from one keyframe to the next at a constant rate. Motion options change Premiere's temporal interpolation method, so that the rate can change between keyframes. In other words, movement can accelerate or decelerate from one keyframe to the next. This way, motion can ease into or out of a position, which can look more natural. Note that these options don't change the time between keyframes. Whether it accelerates, decelerates, or moves at a constant speed, the clip traverses the distance between keyframes in the same amount of time.

To select a motion option:

1.
In the Motion Settings dialog box, select a keyframe.

2.
From the Motion pull-down menu at the bottom of the Motion Settings dialog box, choose one of the three interpolation options (Figure 14.46):

Figure 14.46. From the Motion pull-down menu, choose one of the three motion options.


Linear—motion proceeds from the selected keyframe to the next keyframe at a constant rate, in a linear progression.

Accelerate—motion proceeds from the selected keyframe to the next keyframe slowly at first, then more quickly.

Decelerate—motion proceeds from the selected keyframe to the next keyframe quickly at first, then more slowly.

Regardless of the option you choose, the time between keyframes remains the same. If the Show Paths option is checked, you can see changes in speed in the motion path (Figure 14.47).

Figure 14.47. If the Show Paths option is checked, you can see changes in speed in the motion path.



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