RE: filmscanners: Nikon Scan & VS Negative dynamic range

[Tony Sleep]

On Wed, 5 Sep 2001 23:29:34 -0400  Austin Franklin ([EMAIL PROTECTED]) 
wrote:

> Mapping the input data into 8 bit values has nothing to do with the 
> dynamic
> range of the A/D data

Arrgh... not this again! :-)

Actually it does, because analogue voltages are mapped linearly by the ADC, 
so with 8bits the maximum ratio between min voltage (noise) and max voltage 
is 1:256

That is why some scanner manufacturers are able to disingenuously base ODR 
claims on bit depth without measuring anything.

Regards 

Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info 
& comparisons