On Thu, 24 Jul 2008 10:21:19 +0100, Invisible wrote:

>>> But then, isn't film inherantly noisy too?
>> 
>> Not really, not in the way digital image sensors are.
> 
> Really? I thought film was well-known for being grainy at low light
> levels...

Depends on the film speed and camera characteristics.

>>> Heh, not even DCT artifacts? :-P
>> 
>> No, just some banding in the sky due to you effectively losing the last
>> 2 least significant bits of data.
> 
> I'll have to try it at some point I guess.
> 
>> BTW, on a lot of digital cameras now you can save your images in "raw"
>> format, which is usually 12-bit per channel.
> 
> My camera isn't that expensive.
> 
> (Kinda amusing how not denying access to data is a "feature", eh?)

You're not the first to make this observation.  For some cameras, there's 
actually alternate firmware you get get that enables this on low-end 
cameras that don't expose RAW data to the end user.

Jim

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