Hi James,
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then into Star tools for processing. Came out awful - grids everywhere.
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This is actually a feature in StarTools! The scaling algorithm intentionally creates aliasing effects, so that incorrect Bayering settings manifest themselves by generating an aliasing/grid pattern, even at larger scales. StarTools did you a favor here by showing you a latent grid pattern, as it was designed to do.
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I got into that screen that says this is a preview. Great...Only there was no way to "keep" or save the image.
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This is by design - as the popup states, it's a
preview. Final noise reduction can only be performed when you switch Tracking off. This is so that Tracking has had the longest time to record how the signal has evolved, thereby being able to pinpoint with precision the noise component for every pixel. If you'd like to know more about Tracking and what it is doing exactly, you can read up on it on the website.
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As for Star Tools, well it has let me down once too often.
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I'm sorry to hear that. Do let me know if there is any particular area it has let you down in!
If you're moving from StartTools to PixInsight (or the other way around), there is a handy translation table
here for going back and forth between ST and PI terminology.
Clear skies,