Apple Shake 4 Tutorials Manuale Utente Scaricare il pdf (Pagina 185)

Chapter 6 Using Primatte 185

The alpha channel reveals the basic key. The majority of the background should appear

black in the alpha channel.

Note: If most of the background is medium gray, the center control was not selected

when you scrubbed for the bluescreen color. Make sure the center control is active,

then scrub the bluescreen again.

Output, one of the first parameters in Primatte, determines what is passed out of the

node. The output is set to “alpha only” by default.

Primatte contains the following output parameters:

• alpha only: Only the alpha channel is modified; no spill suppression is performed.

• on Black: Foreground is composited over black and spill suppression is performed.

• comp: Foreground is composited over the background image with spill suppression.

• status: Displays Primatte’s pixel analysis, allowing you to see how pixels are being

processed under the parameter settings. In this reference mode, pixels are displayed

in four categories or zones, represented by the following (arbritrary) colors:

• Black represents pure background.

• Red represents pure foreground.

• Blue represents transparent areas.

• Green represents transparent areas for spill suppression.

For more information about status color zones, see “Inner Mechanics of Primatte”

below.

To set the output mode to view the composite:

In the Primatte output parameters, enable “comp.”

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Apple Shake 4 Tutorials Manuale Utente Pagina 185