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Chapter 12. Working with Shapes and Masks > Creating Transparency with Masks

Creating Transparency with Masks

When you create a mask, you tell Motion how to change the transparency of an object. The information about the level of transparency in different regions of an image is called an alpha channel. The alpha channel is stored as grayscale information, with white indicating full opacity, black indicating full transparency, and shades of gray partial transparency (Figures 12.28 and 12.29).

Figure 12.28. In this image, a mask has been applied to remove the sky. The edge of the mask is feathered where the sky meets the wave.



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