PixInsight Forum (historical)

PixInsight => General => Topic started by: Cosmic_Christopher on 2019 December 22 18:28:32

Title: Weird Dark Halos in Mono Stacked image
Post by: Cosmic_Christopher on 2019 December 22 18:28:32

I am following the Light Vortex Astronomy workflow for image calibration and integration. I'm stacking my images and I'm getting a problem with dark halos around my bright stars. It worked great for removing other things like satellite trails, but ImageIntegration seems to be clipping data around my bright stars. I'm new to this so I'm sure there are key details I'm leaving out that would help you figure out what I'm doing wrong.

Title: Re: Weird Dark Halos in Mono Stacked image
Post by: dld on 2019 December 23 00:52:57

Without specific details and/or an image it's hard to guess what's going on. How does the bright stars look like if you integrate without using a pixel rejection algorithm? (Pixel Rejection (1) > No Rejection). Have you tried using a higher Sigma high value?

Title: Re: Weird Dark Halos in Mono Stacked image
Post by: pfile on 2019 December 23 09:24:41

did you use LocalNormalization? try skipping that and tell ImageIntegration to use built-in normalization.

rob

Title: Re: Weird Dark Halos in Mono Stacked image
Post by: Cosmic_Christopher on 2019 December 23 16:08:48

Brilliant. I got rid of the LocalNormalization Files and it fixed it. Thanks again

Title: Re: Weird Dark Halos in Mono Stacked image
Post by: pfile on 2019 December 23 21:04:37

ok that's good news. you might be able to get LN to work better if you increase the scale factor to 128.

rob