Digital BW, The Print

----- Original Message ----- 
From: "Steven Karafyllakis" <steve@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Friday, February 20, 2004 5:15 AM
Subject: Re: [Digital BW] Scanning Negs


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
<paul.roark@v...> wrote:
>  Too often the "negative" scans seem to clip or
> unduly compress the ends of the curve.

>This brings up a point I felt should be made about the Nikon;
That
LED light source is adjustable over a two-stop range, something
no
fluorescent tube scanner can do. Dropping the 'analog gain' (why
they chose to name it something so un-enlightening is a mystery)
.5-
1.0 stops takes care of that clipping and compression, centers up
the data, and allows you to go directly to positive without loss.
Conversley, turning it up on a dark, contrasty transparency (mine
are all perfect, I had to borrow one to test the idea-right) will
extract shadow detail with less noise. And in extreme cases you
can
do two scans, one for each end, by varying the light
intensity-that
covers a much wider contrast range, again with relatively clean
shadows.

Steve Karafyllakis

http:// www.stevekphoto.com<

The two samplings + the right computation is done with the "long
exposure" setting in Vuescan. So "analogue gain" is not the
suitable name for a 'longer exposure' or 'more light' as it
doesn't shift the A/D conversion but "longer exposure" isn't the
simple slower scan either and may actually come closer to the A/D
shift effect. It works with probably all the Vuescan supported
scanners.

Ernst




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