Apple Motion 2 - Manual (Page 763)

Chapter 10 Using Filters 763
2 Import the foreground image for which a matte needs to be generated.
3 Select the foreground object, and turn off the background to directly observe the
filter’s effects.
4 Apply the Primatte RT filter to the object.
The Primatte RT filter makes a guess as to the non-subject color you are trying to
remove. It makes a guess based on the dominant color present in the image, which
may or may not be the color of the background. For example, if the image is a large red
object that obscures most of a greenscreen, Primatte RT selects Red as its base sample.
In this case, however, Primatte RT correctly guesses that you’re trying to key out the
blue color. If Primatte RT’s guess is incorrect, use the Auto Sample buttons to choose a
different color.
01112.book Page 763 Sunday, March 13, 2005 10:36 PM