Using Masks for an Iris Effect
From Adrien-Luc Sanders, former About.com Guide
Yet another of the many uses for Flash’s masks is the iris effect: mimicking the iris diaphragm of a camera by closing in and out of a scene with a black obscuring layer. We’ll just need a couple of layers and shapes to create this effect, so start off by creating a base layer with the shape/scene/image that you want to iris in/out on. I’ve just used a default stock image from Flash’s sample library.
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