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Hi John,
As the others have said, the brown is part of the scene and I would say if you’re doing wide field it’s best off left in. If you really do want to remove it and you’re using photoshop you can do an inverse selection of the nebulae so you’re just selecting the rest. Take that selection and make a new image and paste it in. Use blur tools over and over again until you can’t see any detail left in the image, just a blury colour. Then select all of that image and paste it in a layer in your original image with the blending technique set on subtract. You won’t want it to be blended 100% so adjust the opacity up and down until you’re happy with the result. Hope that helps.
Cheers
Ryan
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