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Hi George - thanks for the link to the tutorials. I'll go through these as they are not ones I have seen before.
Hey sil, the reason for this mask is I am following a tutorial in Warren Keller's book, Inside PixInsight, and in the example workflow he builds a range mask around a nebula, Binarizes it, applies convolution to soften the edges around the nebula and then subtracts a star mask. When it is inverted you can then bring out the colour etc in the nebula and protect the stars in front of the nebula. But the star mask I had was way too noisy and hence affecting the background.
Thanks for the idea of a recursive range mask. I'll also give that a go.
David
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