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Lesson 10. Keying > Understanding Primatte

Understanding Primatte

In this lesson, we’ll use Photron’s Primatte chroma-keying system. To use Primatte effectively, you need to understand the application and how it works. Primatte constructs a 3D space defined by three concentric partial spheres. Through a series of color scrubs, Primatte places colors along red, green, or blue axes in the 3D space and assigns them to one of four different zones.

Zone 1 is the complete background image; zone 2 is the foreground image with spill suppression and transparency; zone 3 is the foreground image with spill suppression; and zone 4 is the complete foreground image, 100 percent opaque with no spill suppression. As you scrub on an image, Primatte pushes and pulls on the partial spheres based on which function you use, creating dents and bumps on the surfaces. The position of the dents is determined by the pixel values as located on the RGB axes.


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