It's been several years, but I seem to remember that when I got my
Nikon 4000ED filmscanner they were claiming a Dmax of somewhere
around 3.5 to 4.0, but I measured it (by scanning a Kodachrome IT8
target slide and examining the greyscale separation) at around 2.1
to 2.9 (don't remember the exact number). This kind of disparity
between manufacturer's claims and real-life performance is the rule,
not the exception.
--Bill
At 8:30 PM -0600 3/24/05, Andrew Skretvedt wrote:
>In evaluating a film scanner, one should consider its dynamic range. How
>deep can a scanner reach in and pull out shadow details from a very
>contrasty slide, for example. What about one that might have been
>underexposed a bit as you tried to keep from blowing out highlights?
>
>I've seen some dynamic ranges posted for certain scanners here and
>elsewhere, many appear to be measured figures. But for the Minolta
>DiMAGE Scan Dual III and IV, the posted figure is 4.8 (calculated).
>
>That figure appears to be the theoretical dynamic range for the bit
>depth of the capture. Of course this is not going to be its true range.
>Does anyone know the actual range of these scanners? How is dynamic
>range measured?
--
======================================================================
Bill Fernandez * User Interface Architect * Bill Fernandez Design
(505) 346-3080 * bf_list1 AT billfernandez DOT com *
======================================================================
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