Imaging recource: How to reduce noise in a single night sky exposure without losing star detail

As we have seen before, stacking night sky images is the best method for reducing noise. However, this assumes that you are shooting stars or the Milky Way rather than something like aurorae, where stacking multiple exposures would wash out certain definition or colors. So what if you have a single exposure but still want to reduce noise, what is the best method? Greg Benz has just published an excellent tutorial where he relies on the plug-in Nik Dfine (which is available for free here) and luminosity masks. But before we get...
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