Excellent image Andy!.
Based on forum usage reports, I tried Topaz gigapixel AI, it was apparently better than Denoise AI and Sharpen AI combined for astropics. To my surprise, binning X2 an image and then gigapixel up scaleing it back to native res gave stunning results !!. (the algorithm denoises and sharpens too). Geez you know, is this fake, if it actually reasonably "sharpens" blurred bits in a sort of deconvolution fashion, then this has some scientific credibility, convolution is a mathimatically reversable effect. That binning helped (halving the res) is interesting, perhaps this allows more accurate processing with reduced noise.
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