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[filmscanners] RE: Dynamic range question



> From: Andrew Skretvedt
>
> 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?

Dynamic range is limited by noise in the sensor. You rarely see specs on
this, even though a meaningful spec standard could certainly be devised.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

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