Classroom in a book

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Linear
: This method is the default behavior, which creates a uniform rate of 
change between keyframes.
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Bezier
: This method lets you manually adjust the shape of the graph on 
either side of a keyframe. Beziers allow for sudden acceleration changes into 
or out of a keyframe.
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Continuous Bezier
: This method creates a smooth rate of change through 
a keyframe. Unlike Bezier, if you adjust one handle, the handle on the other 
side of the keyframe moves in a complementary fashion to ensure a smooth 
transition through the keyframe.
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Auto Bezier
: This method creates a smooth rate of change through a 
keyframe even if you change the keyframe parameter value. If you choose 
to manually adjust its handles, it changes to a Continuous Bezier point, 
retaining the smooth transition through the keyframe.
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Hold
: This method changes a property value without a gradual transition 
(sudden effect change). The graph following a keyframe with the Hold 
interpolation applied appears as a horizontal straight line.
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Ease In
: This method slows down the value changes entering a keyframe.
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Ease Out
: This method gradually accelerates the value changes leaving 
a keyframe.

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ADOBE PREMIERE PRO CS5 CLASSROOM IN A BOOK
177
Your Effect Controls Timeline should look like the one shown here (the Value 
and Velocity graph-limit numbers might differ, depending on the size of your 
Effect Controls panel).
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Play the entire clip, and marvel (really) at how slick it looks.
Simply by adding keyframe interpolation, you’ve made your Motion effect look 
much more realistic.
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Select the second keyframe—the Bezier hourglass—to activate it.
Pen Tool handles appear on the Value and Velocity graph keyframes as well as 
on the two adjacent sets of keyframes. That’s because changing one keyframe’s 
interpolation handles can change the behavior of the keyframes next to it.
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Drag the handle on the Velocity graph keyframe (shown here).
This creates a steep velocity curve, meaning the title will accelerate quickly and 
then decelerate quickly, but it will still spin only twice between the first and 
second keyframes. You changed the velocity without changing the value.