Apple Motion 5.1.1 - Manual (Page 439)

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Keyframing overview
Keyframing is the process of assigning a parameter value to an object at a point in time.
Although behaviors are ideal for quickly adding complex motion or effects to an object,
keyframes provide additional precision, ensuring that a specific event happens at the exact frame
you choose. For example, if you want to time a movement or effect to match a musical beat or a
word in the soundtrack, a keyframe is the best tool for the job. Further, any effect where multiple
objects are affected in a coordinated way is usually the result of keyframing.
Motion provides two different keyframing methods that allow you to animate using the
workflow you are most comfortable with. The first option is to turn on the Record button, which
creates a new keyframe whenever you adjust any parameter. The second option is to manually
add a keyframe to a parameter. After a parameter contains a keyframe, any further adjustment
to that parameter adds a keyframe at the current playhead position, regardless of the Record
button state. For more information, see
Keyframing methods on page 442.
When you set more than one keyframe, Motion interpolates the in-between frames, generating
a smooth change over time. For example, if you want a title to change from green to blue over
time, you can set two keyframes at two points in time. The first keyframe defines the text’s color
as green, and the second keyframe sets the color to blue. Motion makes the frames between
those points change smoothly from green to blue.
Keyframing
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