Brown blobs on image

[TheMan]

I live next to the city in bortle 8 skies while the city next to me is bortle class 9. Orion rises there and is there for most of the night. after imaging and processing 7 hours on the horse head nebula i'm left with these brown patches in my image and i don't know what they are. I was wondering if anyone knew what they were and how I could fix my image. I use photoshop cc 2017 for main processing and pixinsight 1.8 for gradient removal.

[almcl]

I think the 'brown' patches are actually fainter nebulosity associated with that area of Barnard's loop.

If you have a look at other images (here or here, for example) you can see similar, although slightly more reddish, areas.  Always assuming I am looking at the same areas that you are concerned with?

Nice capture, by the way.

[TheMan]

Thank you. I am relieved it's faint nebulosity and issues with my camera/optics.

[michael.h.f.wilkinson]

Pretty sure they are actual nebulosity. This wide-field taken with a 200m F/2.8 at F/3.5 shows a lot of fluff in the background as well. Had I exposed longer, no doubt more would have appeared.