Adobe After Effects CS3 Bedienungsanleitung Seite 269

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AFTER EFFECTS CS3
User Guide
264
See also
About alpha channels and mattes” on page 252
Split a layer” on page 146
Convert a layer into a track matte
1 Drag the layer that will be the track matte directly above the layer that will be the fill layer.
2 Define transparency for the track matte by choosing one of the following options from the TrkMat menu for the
fill layer:
No Track Matte No transparency created; next layer above acts as a normal layer.
Alpha Matte Opaque when alpha channel pixel value is 100%.
Alpha Inverted Matte Opaque when alpha channel pixel value is 0%.
Luma Matte Opaque when a pixels luminance value is 100%.
Luma Inverted Matte Opaque when a pixels luminance value is 0%.
AfterEffectsconvertsthenextlayeraboveintoatrackmatte,turnsoffthevideoofthetrackmattelayer,andaddsa
track matte icon next to the track matte layer’s name in the Timeline panel. The Composition panel displays the
fill layer viewed through the alpha channel of the matte layer.
Note: Although the video is turned off for the matte layer, you can still select the layer to reposition, scale, or rotate it.
Select the layer in the Timeline panel, and then drag the center (indicated by a circle with an X) of the layer in the
Composition panel.
See also
About alpha channels and mattes” on page 252
Preserve underlying transparency during compositing
The Preserve Underlying Transparency option causes the opaque areas of a layer to appear only when positioned
over opaque areas in underlying layers. With this option, you can make a layer visible only when it is positioned over
the layer below it. It’s useful for creating effects such as glints or light reflecting off a polished surface.
Select the T option in the Modes column for the appropriate layer.
Animating masks
Alejandro Pérez provides a script on the AE Enhancers forum with which you can use tracking data to position
individual mask vertices: www.adobe.com/go/learn_ae_alejandrotrackmaskvertices.
Scott Squires provides a pair of movies that show how to rotoscope, both painting and masking:
www.adobe.com/go/learn_ae_scottsquiresrotoscope1
www.adobe.com/go/learn_ae_scottsquiresrotoscope2
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