When I open 'Remove Light Pollution"...

What camera are you using and if it's a regular astro-cam, what is the offset you used?

I am using the Asi533mc pro camera.  I also use the AsiAir Pro and am not able to adjust the offset.  

Just so you know.

Ah, so can you check the FITS header to see what the offset is at? Should be somewhere in that window left from the image.

Hi,

When I look at the histogram on your screen-shot above, I see what looks like a single column of what would be very cold dark pixels at the very left hand side then a gap of about 80% of the histogram space before seeing all the values piled up at the right hand side.

I would guess that you can make your data more visible by adjusting the B and/or ST filters.

I suggest that something has gone slightly amiss during Calibration that these cold pixels have not been detected and removed.  Maybe you can try adjusting the Cosmetic Correction / Cold Column Kappa values on the Calibration tab to get a better result.   As I recall the Christian Sasse video shows you how to view what effect changing these values has on your subs.

Regards

Mike

Well spotted Mike, that might contribute.