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



Anthony,

> Austin writes:
>
> > 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.
>
> Are you sure?

Yes.  As far as film scanners go.

> In any case, a pattern is a rate, from the standpoint of
> information theory.

Yes, but has nothing to do with the electronics of a film scanner.  Scanners
are purely static devices.  They measure what they "see", and this
measurement is not done with any particular time constraint.

> So it takes time to scan, but there is no rate?  Hmm.

The rate of the scanner is not relevant, and has nothing to do with the
electronics or the image data.  The data that is captured has NO time
property at all.  Nothing changes because you scan faster or slower, given
you are above the exposure and settling time of the mechanism.  Scanner data
has a spatial position property (relative to other data samples) and a
density value...that's it.

I really don't know what you are trying to get at here, Anthony.

Austin

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