[filmscanners] RE: Film resolution - was: Re: 3 year wait

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

> > Some understanding you appear to be missing is that film
> scanners are NOT
> > "point" samplers.  They sample a physical "area", and get an average
> > "reading" from that area that the sensor "sees" (is in its FOV).
>
> In terms of actual implementations, there is no such thing as
> point samplers in any sampling technology.  Anywhere.  Any physical
> technology.  That isn't anything "special", particularly.  IMO anyway. :-)

There is a difference between the sensor acquisition system in a scanner,
and the fact that the sensor it self covers a physical "area" and averages
the information in that area, and that subsequent areas that are covered
encompass the entire area of the film (give or take small gaps and
overlaps), vs, a sampling "window (in time)" that is far far less than the
frequency of the signal being sampled.

To put it simply, film scanners sample %100 of the physical image, other A/D
systems typically don't, they cover a very small portion of the audio signal
when sampling, unless they are sample (average) and hold...which, for a sine
wave, would never give you peak amplitude anyway.

Austin

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