Game Development Reference
channel of Lab, YUV, and RGB, respectively. After increasing the
Fuzziness value, our key of the Arbeats autumn leaves footage is
looking pretty good, especially considering the lack of help from
other effects. Also note that the edges of these leaves are smooth
when played back (Fig. 10.11).
Figure 10.11 After pulling a key
with the Color Range effect.
The Difference Matte Effect
The Difference Matte effect is a really great idea—in theory.
But in practice, it just doesn't always work out that great. But per-
haps you'll have better luck with it than I have. The purpose of the
effect is to use two layers that are otherwise identical, and isolate
the part(s) that are different. Let's say you had a video of a dancer
dancing around. And you also had a segment of the video (or per-
haps a still camera shot) of the same spot where the dancer was
dancing, but without the dancer. In theory, you could use the
Difference Matte effect to compare the footage with the dancer
and the footage without the dancer, and then extract the dancer.
Let's look at an example of this effect in action. If you'd like
to follow along, open the Difference Matte.aep project in the
Chapter 10 folder. I have here some footage of my buddy Paavo
from malachyte.net doing some crazy unicycle work (Fig. 10.12).
I also have a still (actually an extracted frame from the same
video shot) that contains just the benches (Fig 10.13).
The idea is that we can isolate Paavo using the Difference Matte
effect because we have these two pieces of footage. But we'll
quickly see why this effect often falls apart. Apply the Difference