4 replies to this topic

[Cavallotkd]

Hello, 

 

I am struggling with star removal using the starnet plugin in siril.

I am working on a ncg7000 image and bright stars like Deneb and Xi Cyg are only getting partially removed, always leaving a lens flare in the starless version. 

I've tried removing in post the flares, but the remaining "stars" are green and/or have poor resolution. 

 

I wonder if there is a way to modify the way starnet recognizes the stars in siril, so that even the brightest ones are picked up? 

 

edit: that happens both on pre-stretched images, or linear images where starnet does the preliminary stretching. I've also tried custom stride set at 128 instead of 256, but without success

 

thank you!

 

 

Edited by Cavallotkd, 03 October 2023 - 09:39 AM.

[stefsaber]

I'd be eager to see any suggestions too. Deneb is especially a pain. What I did try once, was to the run starnet ++, then export as a TIF to photoshop the starless version, and just Photoshopped out the remnants. Works better on stars not in the middle of nebula though...

[rj144]

Try doing a slight stretch with the stars using GHS.  Do a stretch just so the stars are visible a bit (you can also play around with the highlights slider to keep the bright stars from clipping).  Then, run starnett.

[AhBok]

Agree with rj144. I use the asinh stretch at about 10-20% on just those objects where this problem occurs. Be sure to uncheck the pre-stretch box in Starnet.

Caveat: even this sometimes does not work on all stars, so PS is, for me, the final option.

[Cavallotkd]

thank you!

it seems a combination of asinh + upsampling 2x seems to work. 

i've noticed the upsampling yields poor results on the starless though, so I am recombining images from different tests.

 

I've found additional tips here, https://www.starneta.../tips-tricks/, 

and it seems there is a dedicated starnet thread on the expert forum - https://www.cloudyni...556-starnet-v2/