Thanks for explanation! Guess I will have to use more conventional noise removal techniques, as I think (as Mark pointed out) the noise would change too much between the dark shot and normal shot - after all, it's called "noise", being irregular. I am not sure if it can work very well in the E20, btw, won't the noise pattern change too much even if they do it just before exposure? they must be very quick. Colour noise is not much problem, easy to remove, but what is a problem is luminance noise, extremely hard to remove without sacrificing detail. I find out that giving more exposure usually helps, but I used so far my digicam almost only to get news pictures of a music festival, where of course lighting wasn't ideal, so I had to use 400 iso anyway. For newspaper, it was ok fortunately.
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