When you say stack LRGB do you mean colour combine? You don't stack LRGB images as such. You register/stack individual sub exposures of luminance together and same for each of red, green and blue. Then you register the masters for LRGB (I use CCDstack and binning is compensated automatically). Then colour combine (I use CCDStack to do colour combine, some use Photoshop).
Greg.
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