A trick for getting rid of those weird purple halos around bright stars in my stacked images

I was about to give up on a shot of the Orion Nebula from my backyard in Phoenix, but stacking with a 20% lower sigma clip in Siril actually cleared them right up, has anyone else found a better method for that specific artifact?

3 comments

3 Comments

dylanbell2mo ago

Elliot's right, sigma clipping is basically telling your software to behave.

elliot_allen652mo ago

Yeah, messing with the sigma clip is the only thing that's ever worked for me too. I fought those purple fringes on my Andromeda shots for weeks. Tried all the fancy de-halo tricks in post-processing and they just made a mess. Lowering the sigma to reject more of those outlier pixels during stacking is the real fix. It's like the stacking software finally listens and throws out the bad data. Saved a ton of my early data from the trash.

chen.jade1mo ago

Funny how often the best fix is just telling a system to ignore the junk instead of trying to fix it later. You see it everywhere from data stacking to cleaning out a closet. Sometimes the smartest move is just a better filter.