Adobe Premiere Pro 2.0 [Electronic resources]

1.

Replace the video and text clips on the Timeline with Graphic 9.psd from the Project panel.

2.

Lengthen that arrow graphic clip in the Timeline by dragging its right edge to about the 10-second mark.

3.

Stretch the Effect Controls panel as wide as practical. If you put it in a floating window, leave room to view the Program Monitor.

4.

Open the Effect Controls panel's timeline (click the Show/Hide Timeline View chevron button).

5.

Add Rotation keyframes in four places: the first and last frame plus two more in between.

To do that, position the CTI at the beginning of the clip, click Rotation's Toggle Animation button (that places a keyframe at the beginning of the clip with the default parameter value of zero), drag the CTI to the three other positions and press the Add/Remove Keyframe button in each spot. Your Effect Controls panel should look like the following figure.

[View full size image]

6.

Look at the numbers highlighted in the previous figure.

• 100 and 100Default values for the highest and lowest Rotation parameter settings. They will change to accommodate the actual high and low Rotation parameters once you change the keyframe settings.

• 1 and 1Default relative velocity values. Since you have not changed any parameters, the velocity is a straight line with the value of zero.

7.

Change the Rotation value for the second, third and fourth keyframes using three methods (navigate to the keyframes using the Go To Next/Previous Keyframe buttons).

• 2^nd keyframeclick the Rotation number and type in 2x (two full clockwise rotations).

• 3^rd keyframedrag the Rotation wheel left until the value displayed is 2x0.0° (it's difficult to get that exact figureif you end up at something like 2x2.0° that's OK).

• 4^th keyframedrag the Value Graph button to 1x0.0°.

8.

Drag the CTI through the clip and look at the Value and Velocity Graphs and the numbers to the left of the graphs (shown in the previous figure):

• The top and bottom Value numbers have changed to 2x0 and 2x0 (two full rotations in both directions) to show the actual maximum and minimum parameter values. They remain unchanged as you move the CTI.

• The Value Graph shows the parameters' values at any given time.

• The top and bottom Velocity numbers on the left side of the graph note the spread of the parameters' velocity in degrees per second. The numbers shown in the previous figure1x32 and 1x32 mean 392° (360+32) clockwise and counterclockwise. Those values don't necessarily equal the actual high and low velocities but simply define what amount to the current maximum and minimum values on the Y-axis of an X/Y graph.

• The Velocity graph shows the velocity between keyframes. The sudden drops or jumps represent sudden changes in acceleration

  jerks in physics parlance. Points on the graph above the middle of the Velocity Graph area represent positive (clockwise) speeds and points below the center represent negative (counter-clockwise) speeds. The farther the point or line is from the center, the greater the velocity (and you thought high school algebra was a waste of time).

9.

Play that clip.

The arrow will spin clockwise twice, spin faster going counterclockwise four times, and spin slower going clockwise once.

10.

Right-click on the first keyframe and select Ease Out.

That does several things:

• Changes the keyframe icon to an hourglass.

• The Value Graph button now has a Pen Tool handle and the graph has a slight curve.

• The Velocity Graph button has a similar Pen Tool handle and a more obvious curve. That curve shows the velocity change over timeits acceleration.

11.

Play that portion of the clip. The effect looks more realistic.

12.

Right-click on the next three keyframes and give them (in this order) Bezier, Auto-Bezier and Ease In. Here's a rundown on the Premiere Pro Keyframe Interpolation methods:

• Linear The default behavior. A uniform rate of change between keyframes.

• Bezier Lets you manually adjust the shape of the graph on either side of a keyframe. This allows for sudden acceleration changes into or out of a keyframe.

• Continuous Bezier 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.

• Auto Bezier 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 Continuous Bezier point, retaining the smooth transition through the keyframe.

• Hold 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.

• Ease In Slows down the value changes entering a keyframe.

• Ease Out Gradually accelerates the value changes leaving a keyframe.

13.

Play the entire clip and marvel (really) at how slick it looks.

Simply by adding Keyframe Interpolation, your Motion effect looks much more realistic.

14.

Select the second keyframethe Bezier hourglassto activate it. Pen Tool handles appear on that keyframe's Value and Velocity Graph button as well as on the two adjacent sets of buttons. That's because changing one keyframe's interpolation handles can change the behavior of the keyframes next to it.

15.

Drag the Velocity Graph handle, highlighted in the next figure, to the left.

That creates a steep velocity curve, meaning the arrow will accelerate quickly, then decelerate quickly but will still spin only twice between the first and second keyframe. You changed the velocity without changing the value.

16.

Select the third keyframethe Auto Bezier circle iconto activate it.

17.

Drag the handle highlighted in the next figure and note that the circular keyframe icon immediately switches to an hourglass, because manually adjusting an Auto Bezier keyframe makes it a Continuous Bezier keyframe.

Note

As you drag the left handle, the right handle moves in concert with it to keep the Value Graph curve smooth through the keyframe.

18.

Click the Toggle Automatic Range Rescaling button (highlighted in the next figure) to un-constrain the curves.

19.

Adjust one or two handles and note that the curves can extend beyond the boundaries of the Value and Velocity Graphs rectangles.

By activating Automatic Range Rescaling, you always constrain the graph limits within the boundaries allotted in the Effect Controls panel. That's why the values to the left keep changing to let you know what the new upper and lower limits are.