Adobe After Effects CS3 Bedienungsanleitung PDF herunterladen (Seite 376)

AFTER EFFECTS CS3

User Guide

371

See also

“About 3D layers” on page 171

ID Matte effect

Many 3D programs tag each element in a scene with a unique Object ID. The ID Matte effect uses this information

to create a matte that excludes everything in the scene except the element you want.

Original (top left), with ID Matte applied using the near alien as the ID Selection (bottom left), and composited over a new background (bottom

right)

Aux. Channel Isolate elements based on Object ID or Material ID.

ID Selection The ID value for an object.

To determine the ID of an object, select the ID type from the Aux. Channel menu in the Effect Controls panel, and

click the object in the Composition panel or Layer panel using the Selection tool while the effect is selected. If Object

ID is selected for Aux. Channel, ID Selection automatically updates to the Object ID for the object you click.

Feather The amount of feather along the matte’s edges.

Invert Invertstheselection.SelecttomatteouttheobjectspecifiedbyIDSelection.Deselecttomatteouteverything

but the object (default).

Use Coverage Creates a cleaner matte by removing the colors stored behind the object from the pixels along the edge

of the matte. This option works only if the 3D image contains a coverage channel that stores information about the

colors behind objects.

See also

“About 3D layers” on page 171

Audio effects

Backwards effect

TheBackwardseffectreversesalayer’saudiobyplayingitfromthelastframetothefirstframe.Theframesremain

in their original order in the Timeline panel. Select Swap Channels to swap left and right channels.

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