Apple Shake 4 - Manual (Page 86)

86 Chapter 1 An Overview of the Shake User Interface
The two main keyers in Shake, Keylight and Primatte, recognize the background color,
and have a toggle to key the background color in or out. By default, the keyer leaves
the background area black in the alpha channel. To turn the background completely
white, toggle BGColor on.
Shake processes color correction of the BGColor very quickly, as it recognizes there is a
pure correction applied to previously black pixels. If the color correction does not
change black, such as Gamma or Mult, it is ignored. If it does affect the black areas, as
does Add or Compress, it processes these areas, but understands that they are still the
result of a lookup process. Therefore, the DOD does not get reasserted to the resolution
frame. This is the same process that is used when the Infinite Workspace kicks in. So,
even though the pixels outside of the DOD are not visibly different from the pixels
inside, the DOD remains in place. (For more information, see Chapter 7, “
Using the Node
View ,” on page 217.)