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Checkerboard pattern after stacking and star removal? [Deep Sky] Processing techniques · Danny Lee · ... · 5 · 539 · 1

Danny_Astro 2.86
Danny Lee
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Hi all, 

This morning I stacked together some WIP data collected so far just to see how it's looking. 

No processing other than:
- 45x300sec stacked with darks only (no flats, dark flats) Stacking with WBPP and in DSS produces the same result
- Dynamic crop to remove stacking artifacts 
- Stretched using an unlinked STF stretch
- Stars removed using StarXterminator

Has anyone seen this before, any ideas what could be causing this pattern? I also tried gradient removal techniques before removing stars but that still resulted in this pattern.
DSS Stack.jpg

Thanks
Danny
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Danny_Astro 2.86
Danny Lee
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Apologies, perhaps I was a bit premature posting here but I think I've solved it. 

It was caused by StarXterminator, ticking the 'large overlap' box before running star removal fixed the issue. 

Happy to delete this post or leave it here in case anyone else has the same problem down the line?
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richard_ 1.20
Richard
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My understanding is that StarXterminator breaks your image down into separate tiles and analyses/extracts stars based on this. So if there was an error in this process (like ticking the overlapping box) then that would explain why you saw a checkerboard pattern on your image.
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AstroBillUK 1.51
AstroBillUK
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Large Overlap option can help but doesn't necessarily complete eliminate the grid. Not sure what has changed. I never used to get this.
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azharrana 0.00
Azhar Rana
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Thanks for this post, Danny. I'm getting this as well, but even with out ticking 'Large Overlap' I'm still getting the pattern. Can't see it at all before StarX. Anyone have any another suggestions?
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gorann 6.94
Göran Nilsson
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I just had the problem and ticking the large overlap box solved it, so thank a lot for that info! The odd thing is that it happens very rarely. I think I saw it once before with an older version of StarXT, but by now I have used the new version on at least 100 images and then it happened on the 101st and I have no idea what in that image triggered it. As said in this thread I also read somewhere that it has to do with StarXT dividing the image up in squares when doing its job.
Cheers, Göran
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