Inner mechanics of primatte, Using fgbias to remove blue spill – Apple Shake 4 Tutorials User Manual

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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.