Novice question about Background Extraction

Software Siril
1

initial result.fit after color calibration

image
image2156×1442 1.6 MB

I then use background extraction and may I know if I put the green dots correctly? (The middle part is the milky way that I want to show)

image
image2940×1538 1.01 MB

resulting image after background extraction

image
image2154×1518 2.45 MB

Is there anything I should change?

Thanks,
Wilson

2

You should be doing the background extraction before anything else, save initial cropping of the image to eliminate stacking artifacts.

This step is in the tutorials, but it helps to be able to read French:
https://free-astro.org/siril_doc-en/#Background_extraction_1

3

Thanks David