At 05:53 AM 11/18/2008, Chuck wrote:
>Are any of these high pixel count cameras able to deliver a quieter
>image by combining pixels when used at lower resolution settings?
>
>For that matter, does down-sampling a noisy image in PhotoShop result in
>a quieter image? I've never noticed but I don't have particularly noisy
>cameras.
The theoretical noise reduction for random noise goes at the rate of
1/sqrt(N) where N is the number of samples. So, down sampling at
a rate of 1/4 should cut the noise in half.
The only way it can get better than this is if the noise is correlated in
some way.
Wayne
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