Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 268)

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AFTER EFFECTS CS3

User Guide

263

The PV Feather plug-in from RE:Vision Effects provides the ability to control the feather amount for each vertex of

a mask path independently. For information, see the RE:Vision Effects website:

www.adobe.com/go/learn_ae_revisionfxpvfeather.

About track mattes and traveling mattes

When you want one layer to show through a hole in another layer, set up a track matte. You’ll need two layers—one

to act as a matte, and another to fill the hole in the matte. You can animate either the track matte layer or the fill layer.

When you animate the track matte layer, you create a traveling matte. If you want to animate the track matte and fill

layers using identical settings, consider precomposing them.

Define transparency in a track matte using values from either its alpha channel or the luminance of its pixels. Using

luminance is useful when you want to create a track matte using a layer without an alpha channel or a layer imported

from a program that can’t create an alpha channel. In both alpha channel mattes and luminance mattes, pixels with

highervaluesaremoretransparent.Inmostcases,youuseahigh-contrastmattesothatareasareeithercompletely

transparent or completely opaque. Intermediate shades should appear only where you want partial or gradual trans-

parency, such as along a soft edge.

After Effects preserves the order of a layer and its track matte after you duplicate or split the layer. Within the dupli-

cated or split layers, the track matte layer remains on top of the fill layer. For example, if your composition contains

layers A and B, where A is the track matte and B the fill layer, duplicating or splitting both of these layers results in

the layer order ABAB.

A track matte only applies to the layer directly beneath it. To apply a track matte to multiple layers, first precompose

the multiple layers, and then apply the track matte to the precomposition layer.

Traveling matte

A. Track matte layer: a solid with a rectangular mask, set to Luma Matte. The mask is animated to travel across the screen. B. Fill layer: a

solid with a pattern effect. C. Result:thepatternisseeninthetrackmatte’sshapeandaddedtotheimagelayer,whichisbelowthetrackmatte

layer.

To animate a track matte to move with the layer that it’s matting, make the track matte a child of the layer that it’s

matting. (See “Work with parent and child layers” on page 158.)

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