Apple Final Cut Pro 5 - Manual (Page 1187)

400 Part II Project Interchange
You can perform this step as many times as you need to. The goal is to eliminate as
much of the background as you can without affecting the foreground subject. If you
start encroaching on the outline of your foreground element, you’ve gone too far and
should undo. It is not necessary to remove all the background fringe around your
foreground subject with this step; you should focus only on eliminating the major areas
of the background screen.
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Tip: As you key out more and more of the background, you may find it helpful to use a
different background in the Canvas. The Checkerboard 1 and 2 backgrounds may make it
easier to see fringing areas of your picture that aren’t yet keyed out. You can also use other
background shades and colors to compare the key effect against a lighter background.
6 You can remove more of the key color from the background and eliminate more
fringing from the foreground layer without affecting the foreground subject by
adjusting the Color Range, Saturation, and Luminance controls.
The top handles adjust the overall range of hue, saturation, or luminance keyed out,
while the bottom handles blur the difference between the range of color that’s keyed
and the range of color that isn’t.
Note: You should remove the majority of the green screen using the top handles, but
stop at the point where there’s still some fringing around the areas of fine detail in the
foreground subject. This is the point where you should start using the bottom handles
to expand the keyed area more softly. It is not important, at this point, to completely
eliminate this fringing, only to make sure that it’s soft and translucent, rather than
pixelated and solid.