Most images that are downloaded from the camera RAW, have the color information encoded. This is evident by the way the image looks like it viewed thru a flyscreen mesh. You have to convert it to color first before stacking. Because you lose the encoding information by combining the other images encoded info on top of other encoded info.. So first convert to color, then combine them...
What i do sometimes, is i add all the frames together and convert to monochrome, this gives me my luminance. Then i convert some of the frames to color, then i combine them. I then split the color image into RGB, i then bring in the luminance and then combine them using the LRGB combine function. This then gives me a color shot.
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