I have given the suggestions a go and the result looks significantly more like my original large .tif than before, so thanks. I had done some manipulation in DSS and did a bit more in GIMP, still as a .tif. I then opened that in IrfanView and resized to 1200 x what-ever-the-ratio-made-it, with the output to 72 dpi. Then Save-To-Web, setting the output file size to 200kb and voila.
I know I have a long way to go on polar alignment and so much else but am enjoying it.
8 x 30 secs at ISO1600 with Equinox ED80
Bruce
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