I noticed some artifacts on bright stars lately. I use a OSC 2600MC with L-Ultimate filter and stacked with the OSC_Preprocessing script. I also did the same with WBPP in Pixinsight and there are no artifacts. Any idea what causes that?
Right is Siril, Left is PixInsight
We need more information on your processing. What I see here is maybe an issue with pixel rejection.
But again without rejection maps or more details. I can’t say
No processing done except PCC in PixInsight on both stacked images. I have no rejection maps because I used the OSC_Preprocessing script. If I do the steps manually should I change the Sigma high or low value? Default is 3.000 as I can see in the Stacking tab.
You can also add the rejection map option to the script.
However, you can also try another rejection algorithm. It depends on the number of images you have.
But again, we need more information (logs for example?)
https://siril.readthedocs.io/en/latest/Issues.html#send-us-useful-information
This is the log file,
OK. So Winsorized Sigma clipping is good with large set of data. Maybe with 24 images you should try another rejection algortihm, like sigma clipping?
That fixed it completely. I didn’t use the script but loaded the pp_lights, registered and stacked with Sigma Clipping pixel rejection. I learned something today.
