Struggling to get good results on images with high nebulosity

I have the same work flow. It seems the problem is at star calibration. I often wondered how the nebulosity affects the star colour. I imagine that if the star is in the foreground, then its not a problem but if the star is in the background then its light is filtered through the nebulosity itself and calibration with throw off the colour. So I always try to place the calibration boxes in the areas with no nebulosity, which is difficult of course with lots of nebulosity - similar to background and light pollution tools, you have to avoid the nebulosity when making selection boxes - Check out Mabula's tutorial on using the light pollution tool - he slowly works through the frame making small boxes in selected areas, looking for background only.

Usually I stretch the image to the max, to be able to see nebulosity better. Then I do the light pollution correction on the area's where there is no or very little nebulosity. If not, you may reduce nebulosity indeed.

Regarding color correction, this usually works very well, but if you use narrow-band data, which is not broadband, it's not of great use. This is because it uses black body radiation from stars to determine the color and these need to be broadband as a signal to work well.

@vincent-mod
Thanks and sorry for the slow reply.
Yes I use the same method, I use the 30% stretch, full saturation, no saturation protection etc.

Im fairly frustrated at this point. Take this example of the veil, no matter how many or how few, or how well placed the selection areas, I just have this ugly residual "haze".
Id really be interested in seeing what you could do with my data, if you have time or inclination. Maybe im battling some issue deeper than the light pollution tool?

https://1drv.ms/u/s!AgHakjPeM-lyzj3VLzNVuapAxugQ?e=TkWsu9

@ashleypowell

Hi Ashley, I just ran your data though APP and it came out ok, your signal to noise ratio is high though did you use a light pollution?

filter?

Posted by: @gary-clayton

@ashleypowell

Hi Ashley, I just ran your data though APP and it came out ok, your signal to noise ratio is high though did you use a light pollution?

filter?

Thanks, Gary. It certainly looks 100% on what im achieving....

No I didnt, im in Bortle 4 and it was new moon. That said, the object was quite low in the sky and there is definitely glow on what was the low side.
I think theres about 14hrs in that though, which I had hoped would be adequate..

@ashleypowell

I am also imaging in bortle 4 and have the same setup as yourself, as far as processing your data I used 6 very small boxes in the light pollution section of APP which seemed to do the trick. The image below is 32x5 mins with the an Optolong L-eXtreme filter as it makes a big difference with this camera.