RE: filmscanners: Re: So it's the bits?

[Austin Franklin]

>> Scanners use DMax as part of their specs, which is what this whole
>> discussion has been about.  What's your point?

> No they don't. They use OD (Optical Density) range - which is the number
you get when
> you subtract DMin from DMax, for a film target. This is a logarithmic
expression of a
> density range which could equally be expressed as F-stops, a *ratio*.

Well, they do.  Perhaps you ought to reference the following then:

http://www.darkroom.com/Leafscan/Leafscan45Brochure.jpg

It clearly says in the middle column, third item down "3.7Dmax".  With NO
mention of 'OD' or 'Optical Density'.  I didn't say EVERY scanner
manufacturer uses it, but at least one, obviously, does.

> DMax is a film property, not a scanner parameter.

I suggest you take this up with the scanner manufacturers, because some of
them have opted to use it.