Game Development Reference
and Key Out Dissimilar is very much like Key Out Brighter. The
other properties (Edge Thin and Edge Feather) have been covered
already in this chapter (Fig. 10.24).
Figure 10.24 The results of
keying with the Luma Key effect.
These results were achieved with
all properties at their default
values, except for Threshold,
which was at 60.
The Spill Suppressor Effect
As we've been playing around with keying effects in this chap-
ter, you might have noticed that some keying effects leave a small
trace of green around the edges of the subject. Sometimes, there's
just a green refl ection from the screen on your subject. The pur-
pose of the Spill Suppressor effect is to remove the colors of the
background that are left around the edges of your subject. It is
the only effect in this category that doesn't remove pixels; it only
For this example, open the Spill Suppressor.aep project from
the Chapter 10 folder. This contains a more realistic use of
some of the footage we've been keying. We have two clips from
Artbeats—one with falling autumn leaves against a green screen
and the other depicting running children. We're going to compos-
ite these leaves over the footage of the children, to make it look
like these leaves were actually in the shot with the children.
In this project, I've already keyed out the green screen using
the Color Key effect. Because I'm using the Color Key effect, you
know that the results aren't going to be spectacular. Notice how
the green outline around the leaves makes this look especially
fake (Fig. 10.25).
Now, add the Spill Suppressor effect to the UM230.mov layer
(after the Color Key effect). The fi rst order of business is to inform
the Spill Suppressor effect which color needs to be desaturated.