Re: Optical Density ?
Re: Optical Density ?
- Subject: Re: Optical Density ?
- From: bruce fraser <email@hidden>
- Date: Wed, 4 Sep 2002 08:18:43 -0700
At 8:42 PM +1000 9/4/02, David Harradine wrote:
Hi Group
I'm just wondering about scanners that claim dynamic ranges or even d-max's
higher than 4. As I understand the optical density scale there is no
denser a d-
max than 4. Is there a different scale for scanners to that of
traditional film
measurement ?
David,
Repro film routinely has d-max higher than 4, particularly film for
engraving, which usually shoots for a d-max closer to 5. X-ray film
can also exceed a d-max of 4. It's unlikely that any film exposed in
a normal camera will ever get that dense, but densities in excess of
4 do exist.
Bruce
--
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