From: Greg Schmitz (gws1@columbia.edu)
Date: 10/25/02-11:17:31 PM Z
Sandy - Just as 2 "identical images" photographed on different film
stocks will often require significantly different filtration to produce
faithful dupes it is my understanding that color scanning also
requires color correction for different emulsions. Kodak's literature
for Edupe says:
"The KODAK EKTACHROME Film family is characterized by sets of image
dyes that perform very similarly when scanned. The scanner operator
can set up one basic tone scale and color-correction channel for all
EKTACHROME Films, and then optimize the tone scale and gray balance
for the requirements of individual images."
I assume the information entered into what Kodak refers to as the
"color-correction channel" would be a basic "profile" for Ektachrome
film. Duping "mixed" originals (say Ektachrome, Agfachrome and
Kodachrome) onto a single film stock prior to scanning (and then
scanning the dupes) would probably reduce the work required of the
scanner operator. Apparently also the dyes used in some color films
just don't scan well. But then, on the other hand, some digital
materials don't photograph well :*) Fuji's digital output paper, for
example, seems to have "built-in" color cross-over when you try to
photograph prints with a camera and film; my lab complains about it
constantly.
Sorry to go "off topic."
Best -greg
On Fri, 25 Oct 2002, Sandy King wrote:
>
> Greg wrote:
>
> >
> >Sandy - I can not speak to negative films, or scanning for that
> >matter. I would note that Kodak claims that their new Ektachrome
> >duplicating film "Edupe" is designed specifically for scanning. You
> >might check with the folks at Ilford because I seem to recall they
> >made similar claims for their proprietary B&W transparency film. I'd
> >be skeptical though since claims about a products positive aspects are
> >often cooked up by the folks in charge of marketing and propaganda.
> >
> >-greg schmitz <gws1@columbia.edu>
> >
>
>
> My interest is in scanning negatives made in the camera so I don't
> believe that the Edupe film will be of much interest to me. But just
> out of curiosity, why would Kodak design a duplicating film
> specifically for scanning? Is there a big market for making duplicate
> slides and then scanning them?
>
> Sandy King
>
>
> --
>
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