Graphics Reference
In-Depth Information
11
Apply the Tracking Data to the
Pulp Mill
layer.
12
Return to the Composition Window and run a Preview.
The Perspective Corner Pin should have worked well enough for this
exercise, but if this were a client's project you might have to extend fully
the overlay's track, forcing you to manually extend the Track Points
offscreen.
This brings up one last important issue with Motion Tracking - fixing aberrant
Tracker errors.
When Tracking Goes Awry
The
Palm
-
CornerPin
footage is a good
example of a difficult track due to the
PDA track marker's size change. But
there are many other far worse problems
you can encounter: obscuration by
foreground interference, excessive
motion blur, extraneous intermittent
environmental artifacts (flashing lights),
to name just a few.
Revert to the
Motion Tracking.aep
project one more time, then return to
the
Pulp Mill
-
Stabilization
Comp. As
we've previously seen, there are many
excellent features to track in this
shot - and one troublemaker that's hard
to track.
In the
Pulp
footage there's a light to the
left of the conveyor that becomes
obscured by steam billowing out from
the machinery. Try to perform a Track
Motion on this feature and you'll quickly
discover that it's not so simple a task.
