From: Allan Connery (allan.connery@shaw.ca)
Date: 09/04/03-02:16:59 PM Z
I once did a quick-and-dirty experiment with an old Umax Vista S-6e scanner
and my Porta-Trace light box.
I put a strip of 35 mm negatives on the glass platen, with the light box
inverted and pressing down on the negative.
By the way, I opened up the scanner and disconnected the internal light
source. Scanner light reflected from the negative rather than transmitted
through from the light box might have caused flare.
The scan was recognizable, but there's only so much you can expect from a 35
mm neg scanned at 300 dpi.
Unfortunately, there was a fatal flaw: the scans had conspicuous light and
dark banding. This was presumably caused by the fact that an AC fluorescent
light isn't constantly bright. The fluctuations of the light showed up as
bright and dark bands on the scan.
That's as far as the experiment went, but I've been toying with the idea of
building some kind of DC-powered light source: an array of LEDs, maybe,
powered by 5 volts from an old computer power supply, or a low-voltage
halogen lamp, powered by 12 volts from the same source, in an enlarger-style
diffusion box.
But first I'd want a better scanner to make the trouble worthwhile.
Allan Connery
on 9/4/03 10:01 AM, Gordon J. Holtslander at holtsg@duke.usask.ca wrote:
> I wonder if its possible to make a scanner use a larger transparency
> adapter than the manufacturer intended.
>
> The adapter merely provides a different (transmitted) light source rather
> than the scanners internal source for reflected light.
>
> We have a small epson transparency adapter. Out of curiosity I took it
> apart. All that is inside is a very small lighting filament and a set of
> reflectors and diffusers to provide a diffuse even lighting.
>
> If one could determine the approximate lighting level, and get the scanner
> mechanism to travel a greater length in transparency mode it might be
> possible to get a scanner to do big transparancies.
>
> Who wants to do experiments with their expensive scanner :)
>
> Gord
>
>
This archive was generated by hypermail 2.1.5 : 10/01/03-03:08:59 PM Z CST