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Adobe Flash CS4 Professional on Demand by Steve Perspection, Inc. Johnson

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11. Creating Masks

Introduction

You can create mask layers to show and hide parts of your artwork on the Stage. A mask works like a window blocking out everything but a certain area that you define. Any shape, symbol or text object can be used as a mask. The shape you place in a mask layer defines the area that will be visible in the linked layers below it. You can animate a mask to reveal the content on a layer in stages or animate the art in the layer beneath the mask. It is useful for spotlighting and controlling the shape of the viewable area. Masks are great tools ...

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