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Nice work Ken. I think the best way to do OSC Ha is to split the RGB data, then add 10 to 20% Ha data to the R channel to create a new one. Once this is complete re-add it to the GB channels (as a new channel). Then continue to use the Ha as a luminance. You could do most of this in Photoshop. The only concern you may have is rebalancing the new [HaR]GB composite. A bit of trial and error would be required as I'm not familiar with your set up to advise the best method. OSC still need to be colour balanced too. If your stars go weird, simply re-layer the original RGB over the top. Look forward to seeing more.
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