Graphics Programs Reference
In-Depth Information
hand for Tracker node) finishes. When the Tracker finishes processing, the track-
ingpartofyourworkisactuallyfinished.Anythingbeyondthisisnotreallytrack-
ing—it'sapplyingaTracker'sresult.YoucanseetheTracker--accumulatedtrack-
ing data in the track1.x and track1.y fields in the Properties panel as keyframes
( FIGURE 5.6 ) .
Figure 5.6. The Tracker's accumulated data is held in these fields as anima-
tion keyframes.
9. Move back in the Timebar using the left arrow key.
Look at the track1.x and track1.y fields and how they change to reflect the posi-
tion of the pattern box in each frame.
If you subtract the X and Y values in frame 1 from the X and Y values in frame
2, the result will be the movement you need to match the tracked movement. If
youtake that number and invert it (5becomes −5), youwill negate the movement
and stabilize the shot. You can do that for any frame. The frame you are subtract-
ing—in this example, it is frame 1—is called the reference frame .
Now that you've successfully tracked the position of the spoon from frame to
frame, you probably want to use this to stabilize the shot. This is done in another
tab in the Tracker Properties panel.
10. In Tracker1's Properties panel, click the Transform tab.
Note
The Transform tab holds the properties with which you can turn the
tracked data into transformations.
11. Choose Stabilize from the Transform drop-down menu ( FIGURE 5.7 ).
Figure 5.7. Using the tracking data to stabilize.
 
 
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