This page gives some basic details about the Raw Shadow color channel and explains how it is used.
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||Node Editor|| > Add > Render Channels > Color Channel > Type > Raw Shadow
The Raw Shadows channel is useful for changing the appearance of shadowed areas after rendering in a compositing or image editing application. Below is an example of its use, where the Raw Shadows are added (plus) with the Raw Light pass.
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Raw Shadow x Diffuse = Shadow