Conclusion

Conclusion

Primatte Keyer (included as a demo in the book’s disc)
is a viable alternative to Keylight, especially because it
uses an entirely different internal model to create a key.
Whereas Keylight must, by design, be used only for blue,
green or red, Primatte is a geometric keyer that treats R,
G and B (or H, S and B) internally as a three-dimensional
array of color—a box of hues. As you add and subtract
from the key selection, a geometric blob grows and shrinks
inside that box. You can’t see this “blob” but the colors
fully within it are keyed, and it has an outer threshold
region as well. It takes some practice to master, but once
you do, you should fi nd more success getting a good key
on one pass (forgoing the three-pass method discussed
earlier) with Primatte than with Keylight.
The next chapter offers hands-on advice for situations
where procedural matte generation must be abandoned in
favor of hand matte generation, also known as rotoscoping.