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The Alpha channel is a grayscale image that stores the transparency of objects in the scene.

 

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Overview

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The Alpha channel shows the transparency of objects in the scene as grayscale colors. Solid geometry is represented by solid white, while those areas not blocked by geometry within the scene are black. Pixels at anti-aliased edges have varying shades of gray, as do semi-transparent surfaces.

The Alpha pass is generated automatically when rendering with V-Ray for NUKE.

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