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I do have the Nik tools collection, I mighty try a Topaz trial again and compare the Topaz denoise with the Nik Define noise reduction. The HA and Oiii layers are starless already so not hard to give it a run on those. Job for a rainy evening and there are a few of those coming up. But I am keen to hold off and replace the NB data with true mono NB, interpolation of three pixels from one in the case of the Ha and two tto two in the Oiii surely has to have an impact, but I don't know anyone who has back to back tested to see. I am keen to be the guinea pig there.
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