Apple Color 1.5 - Manual (Page 276)

5 To feather the edge of the shape, increase the value of the Softness parameter.
Two additional editable shapes appear to the inside and outside of the shape you drew.
The inner shape shows where the feathering begins, while the outer shape shows the
very edge of the feathered shape. If necessary, each border can be independently adjusted.
6 As an optional organizational step, you can type an identifying name into the Shape
Name field, and press Return to accept the change.
7 Click Attach, at the top of the Shapes tab, to attach the shape you’ve created to the tab
of the Secondary room you were in. (The number of the secondary tab should be displayed
in the Current Secondary field at the top of the Shapes tab.)
8 If necessary, you can also add keyframes or motion tracking to animate the shape to
match the motion of the camera or subject, so the shape you created matches the action
of the shot.
9 When you finish with the shape, open the Secondaries room.
You’ll see the shape you created within the vignette area of the Previews tab. At this
point, the matte that’s created by the shape can be used to limit the corrections you
make, as with any other secondary matte.
276 Chapter 10 The Secondaries Room