On Thu, 06 May 2010 23:09:18 +0200, Nicolas Alvarez  
<nic### [at] gmailcom> wrote:
> "Fredrik Eriksson" <fe79}--at--{yahoo}--dot--{com> wrote:
>> No, there is no pre-bias; that is not how the sensors work. The ISO
>> setting only affects amplification of the analogue sensor output.
>
> There you go. So if you have the raw sensor output, you can change the  
> ISO setting after the fact?

Not quite. The amplification controlled by the ISO setting occurs before  
A/D conversion. By applying amplification to the raw data (i.e. after A/D  
conversion), you also amplify any noise introduced by the A/D process. The  
result is similar, but slightly worse.



-- 
FE

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