Changing speed numerically
You may want to specify speed more precisely than you can by dragging direction handles. In such cases, specify speed numerically in the Keyframe Velocity dialog box.
The exact options available in the dialog box vary depending on the layer property you are editing and may also vary for plug-ins. For each, speed is expressed as described in the following table:
Keyframe type | Measurement of speed |
|---|---|
Anchor Point and Position | Pixels per second |
Mask Shape | Units per second |
Mask Feather | Pixels per second for both the x (horizontal) and y (vertical) dimensions |
Scale | Percent per second for the x (horizontal), y (vertical), and z (depth) dimensions |
Rotation | Degrees per second |
Opacity | Percentage per second |
To specify speed numerically:
- Display the Speed graph for the keyframe you want to adjust.
- Select the keyframe you want to edit.
- Choose Animation > Keyframe Velocity.
- Type values for Incoming and Outgoing Velocity Speed.
- Type values for the following options, and then click OK:
- Influence specifies the amount of influence toward the previous keyframe (for incoming interpolation) or the next keyframe (for outgoing interpolation).
- Continuous creates a smooth transition by maintaining equal incoming and outgoing velocities.
Note: By default, the proportions of the current Scale or Mask Feather values are preserved as you edit the values. If you don't want to preserve proportions, click the link icon 
next to the property values in the Timeline window to remove the icon.