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This page gives some basic details about the Color Channel render pass and what you can do with it in Houdini.

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Overview

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The Color Channel is a container node that allows the output of almost every render channel available in V-Ray. It allows you to extract different color components from the image (i.e. Diffuse, Reflections, Refractions, etc.) to use used later for tasks like compositing.

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Consider for Anti-Aliasing – When enabled, anti-aliasing will be used where possible. 

Filtering – Applies the image filter to this channel. Image filter settings are in the AA sub-tab of the Image Sampler tab of the  V-Ray Renderer node.

Color Mapping – When enabled, the Color Mapping options in the render settings will be applied to the current render channel.

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