[filmscanners] Re: over resolving scans

["Tony Terlecki" <ajt@mrps.demon.co.uk>]

On Tue, Oct 08, 2002 at 05:09:41PM +0100, G. R Harrison wrote:
> Mr Entlich said:
>
> BZZZZZT.  B&W films have very LOW density ranges in the overall spectrum of
> density ranges of films.  You're lucky if you find a density range of near 2
> from B&W print film.
> ===============================
> This simply is not true: an examination of film characteristics in Adams'
> "The Negative" for example, will show half-a-dozen examples to the contrary.
> See especially Kodak Plus-X Professional treated with selenium toner.  From
> the first usable density of 0.3 above Fb+F (Film base + Fog) to 2.7 the
> curve is practically linear.
>

That may be but he uses Selenium toning as an example of performing
expansion in development. This means that the high values may be below the
density required for a normal print. Simply because the above example
produces a maxiumum density approaching 2.7 doesn't mean that it was done
with the intention of trying to use this density range in a print. I suspect
that everything above 2.1 (if indeed there is anything - remember this was
done to expand the range of what was probably a low contrast image) was not
important to the print.

--
Tony Terlecki
ajt@mrps.demon.co.uk

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