Apple Final Cut Pro 7 - Manual (Page 1237)

5 Click the Select Color eyedropper, and in the Canvas, Shift-click another region of the
background you want to key out to enlarge the region of transparency.
Before selecting another range of
color with the eyedropper tool After selecting an additional range
of color
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.
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 If necessary, adjust the Color Range, Saturation, and Luma controls to remove more of
the key color from the background and eliminate more fringing from the foreground
layer without affecting the foreground subject.
The top handles adjust the overall range of hue, saturation, or luma 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.
1237 Chapter 72 Keying, Mattes, and Masks