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Actually, more is revealed with a stronger stretch. Here are two stretches of Doug's 1800 sec dark,the first with ccdstack and the second with maxim. The good point is that there is no trace of defective columns, which is quite unusual. It's also hard to know how much of this is genuine data and how much is due to stretching a compressed jpg, which I imagine will introduce some artifacts. You'd really have to go back to the original files I guess.
Marc's point that scaling a picture can make it look like anything you want is a good one.
Geoff
Last edited by Geoff45; 03-08-2009 at 07:32 PM.
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