Re: Optical Density ?
Re: Optical Density ?
- Subject: Re: Optical Density ?
- From: Jim Rich <email@hidden>
- Date: Wed, 04 Sep 2002 18:22:05 -0400
On 9/4/02 6:42 AM, "David Harradine" <email@hidden> wrote:
>
Hi Group
>
>
I'm just wondering about scanners that claim dynamic ranges or even d-max's
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higher than 4. As I understand the optical density scale there is no denser a
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d-
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max than 4. Is there a different scale for scanners to that of traditional
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film
>
measurement ?
>
>
Thanks,
David,
<<Is there a different scale for scanners to that of traditional film
measurement ?>>
The short answer is no.
A few years ago when we were comparing scanners and their density ranges a
scanner vendor pointed out that the best way to measure the density range of
of their scanner was to use a special gray scale they had created.
Skeptically, I asked why and after some techno mubo jumbo (which was sheer
foolishness) they admitted to me that they did this to get a higher dmax
value for marketing the product. I think that scanner vendor has now gone
out of business.
I find that using either a carbon dye grayscale as well as an IT8 to measure
density and density range provides realistic density readings.
Jim Rich
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