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I tried the RangeSelection but it seemed to include the stars as well. They came in to the selection much quicker than the nebula.
I think I understand your second sentence - the multiply is the mask rendering mode, right?
In my attempt I used the mask on the clone to actually wipe out the stars before then using that resulting image as the mask to the rgb image. Did I really need to do that or do masks "chain" through images?
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