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I used to convert the RAW files to TIF and then extract the red channel (using dcraw and octave) before stacking.
Alternatively, is it possible to set the DSS not to Debayer the images, i.e. to process them as mono? Then you can extract the red channel afterwards in PS. Debayering will mix the channels and you want to avoid this. As Tony said the other channels contain only noise and there is no point adding that to the image.
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