Avid Technology DS 5.0 Guia do Utilizador descarregar pdf (Página 15)

KeylightThe Foundry

BASIC KEYING

Despill Bias

background showing through here. Also, some of the fine hair detail on the

actor, visible in Figure 14, has been eroded in Figure 15.

Despill Bias

Although the foreground is despilled automatically, you may find the need

to pull out a little more of the screen colour after picking from the image.

You can do this with the Despill Bias control. Just increase the parameter

until the blue disappears. However, if you increase too much the foreground

will become transparent.

There are ways to fix that and these are covered in the next chapter. See

“Biasing” on page 18.

Figure 14. Screen Strength = 105 giving a

good Screen Matte.

Figure 15. Screen Strength = 150

giving background show through and

over eroded edges.

Figure 16. Exaggerated blue spill. Figure 17. Despill Bias used to remove the

blue spill.

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Avid Technology DS 5.0 Guia do Utilizador Página 15