Apple Shake 4 Tutorials - Manual (Page 191)

Chapter 6 Using Primatte 191
The currentOp slider scrolls from 0 (the Center pick) to the number of applied
operators. Each operation can be accessed by using the slider. The Center pick is always
0, and cannot be deleted.
To modify previous operators:
m Use the currentOp slider to select the operation you want to modify. Operations are
numbered in the order applied. For example, if you applied a foreground operation, a
second foreground operation, and then a background operation, the first foreground
operator is 1, the second foreground operator is 2, and the background operator is 3.
m Enable evalToEnd to view the effect of all applied operators. When disabled, only the
operations up to the currentOp are displayed. For example, if you have 10 operators
and your currentOp is set to 3, only operations 0 through 3 are calculated by Primatte.
m Use the “active” parameter to quickly toggle an operation on and off to test its effect.
m To re-scrub a color, click the color control and scrub in the Viewer.
m To remove an operator, press the delete op button.
Masking Primatte
In this section, use a holdout matte to clean up the key under the woman’s arm, and a
garbage matte to eliminate the “image courtesy of Photron” text. Holdout mattes add
to opacity, garbage masks add to transparency.
To attach a garbage mask:
1 Click the Image tab, press Command-Shift or Control-Shift, then click the QuickPaint
command button.
An unattached QuickPaint1 node is created.
2 Connect the QuickPaint1 node to the third input (garbageMatte) of the Primatte node.