Re: Black and white negative scanning
Re: Black and white negative scanning
- Subject: Re: Black and white negative scanning
- From: "Richard Frederickson [Contr]" <email@hidden>
- Date: Wed, 14 Nov 2007 10:17:31 -0500
My personal observation is that higher dynamic range scanners produce
less noise in the image. Although the noise in a positive
transparency falls in the shadow detail and is not often a
factor--when you scan negatives it becomes a BIG issue, since now the
noise is in your highlights and VERY noticeable.
In addition to negatives, I use my Imacon Flextight 949 scanner to
capture histology specimens on 1"x3" glass slides. These stained
specimens often exceed a density 4.0 (as well as having a "highlight"
that is clear glass). Faint specimens are equally a challenge. Having
a high dynamic range provides sensitivity in the highlight regions
and the shadow regions without having to sacrifice either one--this
saves a lot of time and frustration!
Richard
Richard Frederickson [Contractor]
Senior Technical Specialist
Scientific Publications, Graphics & Media (SPGM)
SAIC-Frederick, Inc.
National Cancer Institute at Frederick
Frederick, MD 21702-1201
(301) 846-1546
Visit us at http://web.ncifcrf.gov/spgm
On Nov 14, 2007, at 8:14 AM, Chris Protopapas wrote:
A dynamic range of 5.0? You're talking Status T densitometry? I
find that hard to believe. That means the highlights would be
blacker than the DMax of a transparency.
Ah ha - I thought someone would step up and say that! T grain films
in our developer were constantly pushing the ~3.7 range of
traditional scanners. I once had a B&W neg (I forget what it was)
that I slapped on the densitometer and was blown away that it was
almost 5.0. And yes it was clearly darker than common transparency
DMax. Like I'm sure you do, I saw all kinds of crazy originals when
I was a drum scan operator.
And while the common perception of liquid mounting is that it is a
hassle - I personally find it a wonderful process that *saves* time
that often leaves originals in a cleaner condition than they were
prior.
Scott Martin
www.on-sight.com
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