RE: filmscanners: USB and data transfer as a constraint on time needed to scan

["Vladislav Jurco" <vjurco@atlas.cz>]

I work both with Elite/SCSI and Dual II/USB and I see very little difference
(if any) in scan speed. Each will take app. 3 minutes for full res scan
(With ICE in case of Elite). My machine is Celeron 450 with 320MB memory,
scan time was measured with freshly restarted WIN98SE and no app. running in
the background. Minlota's tech spec. indicates 45 s (Elite) - but I did
never even come close to this number. With very dark negatives it grows up
to even more than double (6 minutes) and I can hear how the scanner
radically slows down - so I suppose (IMHO) neither transfer channel nor the
speed of computer (at least 450 MHz Celeron) is an significant issue. With
my old HPS20 (2400 DPI) which was also USB - but I think it didn't have
variable exposure, these times were constant - app. 1 min. 40 secs for full
scan&write to the disk.

Vlad

> -----Puvodní zpráva-----
> Od: owner-filmscanners@halftone.co.uk
> [mailto:owner-filmscanners@halftone.co.uk]za uživatele shAf
> Odesláno: 26. února 2001 6:05
> Komu: filmscanners@halftone.co.uk
> Predmet: Re: filmscanners: USB and data transfer as a
> constraint on time
> needed to scan
>
>
> paul writes ...
>
> > The new Nikon and Minolta scanners use USB rather than SCSI to
> communicate
> > with the computer.  Since USB has a lower data transfer rate than
> SCSI, I
> > was wondering wether this makes any difference for the overall
> amount of
> > time needed to complete a scan.  Is data transfer speed the limiting
> > constraint on the amount of time needed to complete a scan, or is
> there
> > some other aspect of the scanning process that constrains speed?
> > ...
>
>     I would believe a scanner is faster than USB, but not by much.
> The primary time constrant should be that of exposure ... that is,
> image brightness values are more dependent on what the CCD needs for
> integrating the signal, rather than how fast the data can be sent to
> the computer.
>
> shAf  :o)
>
> ---
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