Strange star patterns with Starnet2

7 replies394 views
NAG avatar
Hello,

Does anyone have an idea why Starnet2 leave my stars with these patterns ?



Thanks
andrea tasselli avatar
With bright, overexposed stars it does that. So far I couldn't find a cure (other that not using it). It is less prominent is you do the star removal after stretching the image.
Shinpah avatar
I'd recommend looking at this tutorial, specifically the parts regarding "relinearization"

https://www.nightphotons.com/guides/star-addition
Well Written
NAG avatar
Thanks for your answer.

You're right. If i run StarNet on an unstretched image it's fine. 

Do you know if it happends too with starXterminator?
andrea tasselli avatar
Thanks for your answer.

You're right. If i run StarNet on an unstretched image it's fine. 

Do you know if it happends too with starXterminator?

StarXterminator does not leave artifacts But it might remove some part of the nebula as stars, especially in the linear phase.
Wei-Hao Wang avatar
If that really bothers you, you may try running StarNet++ a few times, each time with different stride parameters, and average the results.  This is my default mode of running StarNet++.

Or you can just circle the area in Photoshop and apply a Gaussian blur to wipe out those.  There are no real data in near-saturated star cores anyway.  StarNet++ tries to create something in areas where there are no real useful information.  If that's no cheating, wiping out what it created by hand shouldn't be considered cheating either.  Can be somewhat time consuming if you have many stars like that, but there is nothing wrong with doing such editing.

My 2 cents.
Helpful Insightful Respectful
Joe Linington avatar
I have done what Mr. Wang suggests and used a small gaussian blur brush on the worst, largest stars before re-combining them. It works.

This is the result of StarXterminator, I like it much better. It even puts the nasty halo on the star layer. This is 57 Cyg in the pelican nebula, a magnitude -1.23 star. You can see that it's a bit nasty in my telescope and had a halo that was removed by StarXterminator.

Helpful
NAG avatar
Thank  you all for the help.

For now i'll remove stars while in linear, not my favorite method but…. it is what it is !

Testing processes like starnet it's a computer killer, so for now i'll have to give some rest to mine.
Related discussions
Need help troubleshooting star shape
Hello, Does anyone know why my stars look like this? Didn't have this problem before. Recent change is a new ASI2600MC camera and I cleaned my telescope (Explore Scientific FCD100 Triplet Refractor). I think I might have messed up the location of...
Author uses Starnet2; candidate discusses star shape issues with camera.
Dec 7, 2024
Star shapes Apertura 8" RC
Does anyone have an idea why the stars on the left side of image look like plus marks. I just got an Aperura 8" RC and collimated using OCAL then on stars. Inner focus and outer focus the stars are round donuts. All subs in LRGB look the same as...
Both posts ask about unusual star patterns and shapes in images.
Jun 15, 2025
Bizarre Stacking Artifacts In DSS
Hello all, I am processing some data I collected on the Tadpole Nebula in Deep Sky Stacker, and got a surprising–and distressing result! The entire image is suffused with a blocky quilt pattern. (See attachment, which is slightly stretched but ...
Blocky patterns in stacked images; similar artifact troubleshooting approach.
Dec 31, 2021