Thanks. I should have figured there would be a square root involved in
something photographic. :-)
Chuck Norcutt
WayneS wrote:
> 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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