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They are reminiscent of older style astro photos. And they do pick up the tidal streams a lot better than colour does. Galaxies are way larger than our images depict but I suppose those outer fringes are too dull to register easily.
Good tip. I didn't notice they had some colour left as they looked black and white in PS. These are pushed using levels. Curves works a bit in reverse in small amounts but levels seems to be the tool to bring them up.
Greg.
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