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On Thu, 06 May 2010 23:09:18 +0200, Nicolas Alvarez
<nic### [at] gmail com> 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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