Deconvolution mask question

General discussion about StarTools.
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dx_ron
Posts: 25
Joined: Fri Apr 16, 2021 3:55 pm

Deconvolution mask question

Post by dx_ron »

I generally have good luck with the 'extra-sensitive' automask. But I am curious what I should do about touching-up a couple of spots.
apodization_mask.jpg
apodization_mask.jpg (395.43 KiB) Viewed 175 times
For the very bright star, I normally expand the mask to include all of the brightest main circle. Is that necessary (or even incorrect)?

And peculiar to globs - should I leave the masking in the core, or should I only mask stars where they are more individually distinct?

Or maybe neither tweak makes much impact on the process.
Mike in Rancho
Posts: 491
Joined: Sun Jun 20, 2021 10:05 pm
Location: Alta Loma, CA

Re: Deconvolution mask question

Post by Mike in Rancho »

AFAIK the 1.8 mask is just for SVD sample selection, and also aids with specific deringing. Deconv will be applied across the entire image based on the variance you have set it up to be applied.

So, touching up the big star (or any others) to more correctly match the stellar profile would be useful if you want to use that star in a blue box, or if it needs a little help if the deringing doesn't seem to be working the way it should.

I think 1.8 is actually much better for globs than the 1.7 version because of that. I would get some smaller glob stars all nice and sharp, but brighter neighbors (masked for protection against artifacts) would still be all fuzzy like they were unfocused!
dx_ron
Posts: 25
Joined: Fri Apr 16, 2021 3:55 pm

Re: Deconvolution mask question

Post by dx_ron »

Thanks. That makes sense. I do sometimes use bright stars for sampling - but not that one. It shows up in the Select screen as a green donut not a circle. It is fun to use decon on globs. Before vs after is like out of vs in focus.
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