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Why is the Lum so critical guys? I mean, I understand you want to have a really tightly defined Lum in photoshop to bring out detail, overlayed with luminosity/hue for colour. Could that just as easily be a monochrome treated Red filter image though? Why does it have to be a clear filter that gives the "lum" layer for processing? (leaving Ha and other complications out of the picture for the time being....)
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