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is visible and thus able to be isolated. You can delete one or more strokes by dragging a bounding
box over a range of frames, and then choosing Clear Selected Track Data from the Magic Mask
Option menu.
d. If a stroke is having trouble following the subject: If the subject you’re tracking is moving too
fast, too irregularly, or is changing shape too greatly for the tracker to give a good result (for
example, someone lifts their arm towards the camera), you can track through the problem area of
the clip one frame by frame using the Track Forward 1 Frame or Track Backward 1 Frame buttons,
and then use the pointer to manually drag the stroke to follow along with the subject as you go.
Once the problem motion stops and the motion of the subject becomes more regular, you can use
the Track Forwards to End or Track Backwards to Beginning buttons to continue tracking as usual.
e. If the subject is moving off the frame: If you’ve drawn a stroke in the middle of someone’s
face, and their face is moving off screen, you can manually reposition the stroke on the last few
frames before the subject completely exits so that stroke continues to identify what parts of the
face are still visible even though the part of the face it was originally following becomes hidden.
Once the face completely exits the frame, you can mute the stroke for the rest of the shot.
6 (Optional) If you only tracked the stroke’s movement over part of a shot, you can click the Jump to
Start or Jump to End buttons to move the playhead to the first or last tracked frame, in preparation
for tracking from that frame onward.
Chapter 135Magic Mask 2701
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