Apple Shake 4 Tutorials - Manual (Page 187)

Chapter 6 Using Primatte 187
To view the color zones in the composite:
m Click the “status” button in the Primatte output parameter.
As you can see, the pixels of the bluescreen—ideally, any pure blue pixels—fall inside
zone 1 (Background).
Note: While we’re talking about blue, don’t confuse the blue pixels from the keyed
image with the blue color-coding that Primatte uses in status mode to display pixels
assigned to zone 3. The color zones in status mode are merely a way to show you how
Primatte is allocating pixels in a composite.
Pixels close to pure blue—but not pure blue—fall inside zone 3 (Transparent FG). Spill
suppression colors are assigned to zone 2. The rest of the colors are in zone 4
(Foreground).
To return to composite mode, click the “comp” button in the Primatte output parameter.
To assign a color in the image to one of the different zones, click an operator button—
background, foreground, spill sponge, and so on—then scrub the color in the keyed
image. In the current image, for example, you can see that the initial key operation has
made parts of the woman’s shirt transparent; you can use the foreground operator to
“pull” these pixels back into the full opacity of the foreground.
To add more of the shirt to the foreground zone:
1 With the pointer over the Viewer, press A to view the alpha channel.
2 In the Primatte1 parameters, click the foreground operator button.