Apple Final Cut Express HD - Manual (Page 820)

820 Part IX Effects
10 If you’re satisfied with your key, but there is some color from the background that is
spilling onto the edges of your foreground subject, you can go back to the Chroma
Keyer tab in the Viewer and adjust the Enhance slider to desaturate this spill so that it’s
not noticeable. Don’t move the Enhance slider too far, or you may get undesirable
coloration in the edge of your subject.
11 If there’s still more colored spill on your foreground subject that the Enhance slider
didn’t eliminate, you can apply the Spill Suppressor filter.
The Spill Suppressor filter desaturates color spill that may appear anywhere on the
foreground subject, not just on the edges. For example, a little of the background color
may show through translucent areas of the foreground subject, such as wispy hair or
sheer clothing. Once you’ve applied the Spill Suppressor filter on your keyed clip, adjust
the Amount slider to determine how much to desaturate the spill color in the
foreground image.
12 To eliminate any unwanted elements that didn’t get keyed out, such as rigging and
lights around your subject, or the edge of the blue or green screen itself, use the Crop
parameter in the Motion Settings tab of the foreground clip to cut those elements out
of the picture. If the area you need to crop is irregular, you can apply a Garbage Matte
filter, instead.
The image is cropped
on both sides to remove
extraneous elements.