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Chapter 2 Motion Tracking 95
Removing Black Borders Introduced by Stabilizing
When you use the Stabilize behavior, the resulting transformations that are made to
smooth or stabilize the shot cause moving black borders to appear around the edges
of the image. While this is necessary to achieve the desired effect, you probably don’t
want these black borders to appear in the final shot.
There are a few ways you can choose to handle this border.
Zooming the Clip
You can zoom the clip using the Borders pop-up menu in the Behaviors tab of the
Inspector.
To zoom the clip:
m In the Behaviors tab of the Inspector, choose Zoom from the Borders pop-up menu.
The clip is expanded to the full size of the Canvas, preventing black borders from
appearing around the edges of the stabilized clip.
Scaling the Output Image to Fit the Original Frame Size
If you need to output the resulting image at the same size as the original, the quickest
fix is to scale the image after the Stabilize analysis. You’ll need to enlarge the image to
the point where all instances of black borders fall outside the edges of the frame. The
disadvantage of this method is the resulting softening of the image, depending on
how much it must be enlarged.
To scale the stabilized image:
1 Select the clip and click the Properties tab of the Inspector.
2 Adjust the Scale parameter so that the borders no longer appear at the edges of the clip.
Distorting the Edges
One last suggestion is to experiment with different filters to stretch the edges of the
image to fill any gaps. For example, you can experiment with the Scrape filter to stretch
out the edges of the image. This solution is highly dependent on the type of image and
may introduce other image artifacts that may or may not be acceptable.