Adobe After Effects CS5 Classroom in a Book (Quentin Trotter's Library) by Adobe Creative Team

Author:Adobe Creative Team
Language: eng
Format: epub
Publisher: Adobe Press
Published: 2010-05-05T04:00:00+00:00

Creating a mask with the Pen tool

The computer screen currently contains a word-processing document. To replace it with the news promo, you need to mask the screen.

Press the Home key, or move the current-time indicator to the beginning of the time ruler.

Tip

You can also create a mask using the Mocha Shapes plug-in, which comes with After Effects CS5, and then import it into After Effects. To learn more about using the plug-in, see After Effects Help.

Zoom in to the Composition panel until the monitor screen nearly fills the view. You may need to use the Hand tool () to reposition the view in the panel.

Select the Pen tool () in the Tools panel. The Pen tool creates straight lines or curved segments. The monitor appears to be rectangular, so you’ll try using straight lines first.

Click the upper-left corner of the monitor screen to place the first vertex.

Click the upper-right corner of the monitor to place the second vertex. After Effects connects the two points with a segment.

Click to place a third vertex in the lower-right corner of the monitor, and then click to place a fourth vertex in the lower-left corner of the monitor.

Move the Pen tool over the first vertex (in the upper-left corner). When a circle appears next to the pointer (as in the middle image below), click to close the mask path.

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