Apple Shake 3 User Manual download pdf (Page 188)

188 Chapter 6 Using Primatte

The foreground operator is assigned and a new color control is automatically activated.

3 In the Viewer, scrub the shirt area.

Note: The Undo function and Primatte are not best friends. To remove an operator, use

the delete op button in the Primatte parameters. To pick a different color, click the color

control (under the delete op button), then scrub in the Viewer.

4 To sample more foreground area, click the foreground button again and scrub in the

Viewer.

5 To re-scrub, ensure that the color control is active, then scrub again.

When using Primatte, knowing when to stop is important. The more scrubs you

perform with the foreground and background operators, the crunchier the matte edge

becomes (this is bad).

For example, you cannot eliminate the dark area under the woman’s arm. Kind of like

that nasty corner in your shower, you can scrub on it all day but it doesn’t disappear.

This is a clue that this particular color is buried way down in zone 1 (pure background).

If you try to assert this color as foreground, you are going to upset the entire keying

model (that is also bad).

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Apple Shake 3 User Manual Page 188