Apple Final Cut Express HD - Manual (Page 818)

818 Part IX Effects
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.
7 Depending on how the edges of your foreground subject look, you may want to make
adjustments using the Edge Thin slider. The Edge Thin slider allows you to shrink the
alpha channel created by the Chroma Keyer to begin to eliminate the light fringing
that remains around the edges of the foreground subject.
Before adjusting the
Edge Thin slider