Graphics Reference
In-Depth Information
problem for several reasons: the
chips dumping out of the truck add
a lot of noise to the shot, the shot
doesn't have any well-defined
features in which to apply Trackers,
and the feature to track moves into
then out of the screen.
For cases where the feature comes
from or moves offscreen, you have
to manually adjust the tracked
overlay to account for the offscreen motion.
But other than these offscreen issues,
preparing for a Scale Track is the same as any
other Multi-Point Tracking:
1
To ease the Tracker's setup, choose a
frame toward the center of the clip
(frame 40).
2
Right-click on the clip layer and
select
Track Motion.
3
Check 'Rotation' and 'Scale', in
addition to 'Position'.
4
Click on
Options . . .
.
5
Select both 'RGB' and 'Track Fields',
then 'OK'.
We're using RGB to track the features
because they have strong color and
luminance differences.
The
Motion Target
is blank because there's
nothing yet in the Comp to apply the
Tracker's data. A good habit to follow is to
use Nulls for applying your data. This allows
you to make further adjustments to your
tracked object after the Track is complete.
