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186 Chapter 6 Using Primatte
The composite appears in the Viewer.
Inner Mechanics of Primatte
So, what is Primatte doing to the image pixels? Whereas Keylight is based on a model of
light and its properties, Primatte works by assigning color to one of four different zones
through a series of color scrubs. Each zone has its own qualities. These zones are
constructed in a 3D space created with the three RGB axes. The following illustration is
a 2D representation of this 3D space.
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