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

["Austin Franklin" <darkroom@ix.netcom.com>]

Anthony,

Whether you are handling 1000000 x 100000 images, or 1 x 1 images, that has
nothing to do with rates.  AND AGAIN, this has nothing to do with the
discussion...

The ability to handle a pattern of B&W lines or gray has nothing to do with
signal rates.  Scanners scan a STATIC image.  Nothing is moving.  It can
take three days to scan the image if it wants...and it'll still get the same
image (within reason) that it would if it scanned it in 5 minutes.

Austin

> Usually systems that can handle high signal rates can also handle
> low rates,
> often right down to DC.  In imaging, for example, a system that can handle
> 1200x1200-pixel images can also handle 10x10 pixel images, and a
> system that
> can handle a pattern of pure black and white vertical lines can
> also handle
> a featureless neutral gray.
>
> ----- Original Message -----
> From: "Paul D. DeRocco" <pderocco@ix.netcom.com>
> To: <anthony@atkielski.com>
> Sent: Tuesday, June 18, 2002 02:21
> Subject: [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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