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Onion skinning is a traditional animation technique that enables you to see and manipulate objects before and after the current frame. When you are creating frame-by-frame animation, this helps you position objects in each frame without flipping back and forth between frames. When onion skinning is turned on, objects in frames before and after the current frame are dimmed so you can distinguish them from objects in the current frame. In the preceding exercise, you placed circles in an arc to simulate them shooting out from the dot in the i. After you play your animation, suppose you decide you want to move one of the circles to change the shape of the arc. When you select a frame, you can't see the circles in other frames, and so in the next exercise you will use onion skinning to reveal the contents of other frames.
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