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The render result is belowenter image description here

But I would like to save the image generated by switching to alpha channel below (the black and white image)

enter image description here

Regular "save as" would override the alpha draw, how would I save the image from alpha channel (the black and white image)?

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1 Answer 1

Reset to default
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In the compositor add a File output node and plug the Alpha output to it and Render.

enter image description here

That way you can save the Alpha channel as a separate file.

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