Paul
When I brought your image up on my laptop - which has different settings to my main frame, I found your image is absolutely full of very faint but impressive dust like "stuff" as in the lower RHS of your image. It certainly looks very real to me and it was quite surprising to see it (Galactic cirrus?).
I have grossly upped the gamma so that it appears more obvious - I hope you dont mind but it would appear to be real and not an artifact
Allan
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