Rings after stacking using Sirilic

Software Siril
1

Have been stacking in DSS and processing in Siril no problem.

Thought I’d try Sirilic to stack using Siril and whilst it stacks okay when I use background extraction I get some weird rings appearing. These are different in R, G and B.
All settings are default. Would appreciate if anyone could point me in the right direction to sort this?

Graeme

stacklines
stacklines1112×887 300 KB

2

Did you run background extraction?

3

Yes, this happens after I run background extraction.

4

You need to add dither to the background extraction as explained in the tooltip.

5

Worked a treat!

Many thanks :+1: