[filmscanners] RE: IV ED dynamic range... DYNAMIC RANGE!

["Austin Franklin" <darkroom@ix.netcom.com>]

Constantine,

Typically, for some reason, marketing people have been confusing the term
dynamic range with density range, and saying a scanner has a dynamic range
of 4.0 (or whatever), when they mean density range.  That is where a lot of
this misinformation on what dynamic range really "means" has proliferated,
at least as it applies to scanners.

Typically, Density Range is measured in Density units, like 4D...and what
that means is the scanner can scan a brightness range of 1 to 10,000...as
the 4 means 10**4.  It's a ratio...and the ratio is "to 1"...so the scanner
can basically scan a brightness range of 10,000:1.

Austin

> Just as a point of reference. For all Polaroid scanners the dyanamic range
> and maximum density or density range are the same.

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