On Wed, 5 Sep 2001 23:29:34 -0400 Austin Franklin (darkroom@ix.netcom.com)
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
- Online portfolio & exhibit; + film scanner info
& comparisons
