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[filmscanners] RE: Density vs Dynamic range>AUSTIN (2a)

The issue is whether or not you need frequency response down to DC. A
scanner obviously does, because a series of alternating black and gray lines
looks different from a series of alternating gray and white lines, even
though they have the same AC component.


Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

> From: Anthony Atkielski
> But samples are not signals, and DC is not a signal.  A current or voltage
> that does not vary (i.e., DC) carries no information, and is thus not a
> signal.  All signals are AC.  More precisely, all signals vary
> over time; DC
> does not vary over time; therefore DC and signals are mutually exclusive.

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