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[filmscanners] RE: Density vs Dynamic range





> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> > The proposed ISO standard on "Photography - Electronic scanners for
> > photographic images - Dynamic range measurements" (WD 21550.3
> (42N 4909))
> > states that the dynamic range is calculated by:
> >
> > DR = Dmax - Dmin
> > DR = Scanner dynamic range
> > Dmax = Density where the signal to noise ratio is 1
> > Dmin - Minimum density where the output signal of the luminance OECF
> > (opto-electronic conversion function) appears to be unclipped
>
> Hi Dean,
>
> Interesting, but if that's what it says, it's simply wrong...in just about
> every statement!  I'll have to get a hold of the spec and see what it is
> trying to say before commenting much on it.

Here is a link to the standard proposal:

http://www.pima.net/standards/iso/tc42/wg18/ISO_21550/N4909_WD21550_v3.PDF

Since it is just a proposal comments can be submitted to:

http://www.pima.net/standards/iso/tc42/wg18/ISO_21550/WD21550_Comment_Form.d
oc

I would appreciate your input on that.

Robert

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