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(And I have no idea what "assembly from green data" refers to. That's running under "fancy" in my book. )
naah nothing fancy at all - when converting colour images to B&W, most software allows you to specify how much each colour contributes to the luminance - need to set red and blue to zero to remove colour fringing from the achro image.
just to be sure - are you asking for comparison images of NGC3372? - I think that is what your image shows.
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