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96 Chapter 2 Motion Tracking
In the following image, a large border is created when the clip is stabilized.
Next, a Scrape filter is applied to the group in which the stabilized clip resides. The left
image shows the clip when the filter is first applied to the group. At first, it does not
appear especially helpful. In the right image, the center and rotation of the filter are
adjusted, removing the black edge by stretching the right edge of the image.
Important: The filter must be applied to the clip’s group, not to the clip, for this
technique to have any effect.
Note: You may need to turn on the Fixed Resolution checkbox in the Group tab of the
Inspector so the effect of the Scrape filter is not cropped.
Some General Guidelines
The Motion tracker uses the source image for its tracking analysis. This means that the
tracker automatically uses the best search area, the best color, the best contrast,
subpixel accuracy, and so on in the clip to generate the best possible tracking data.
Common tracking strategies, such as using filter tricks, manually resizing a tracking
“box” or search area, or specifying a subpixel sampling amount are not required.
This does not mean that you do not have to work to achieve a perfect track, of course.
Use the following guidelines to help you decide what may assist you and what won’t
assist you in your tracking analysis.