Thanks for the replies Glen and Bojan. After further investigation I have discovered that it is not saving the image in mono, but is in fact just saving
one of my original subs[ which in the selected part of the sky shows almost no colour] rather than the image resulting from stacking.
I have reinstalled DSS, and it does the same thing, so it would appear to be a problem with my laptop rather than DSS. Luckily I have an old laptop, so
can still use DSS, but much more slowly.
raymo
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