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[filmscanners] RE: Density vs Dynamic range



Yeah, but Dickbo...obviously you don't understand what it means.  It's got
errors in it...but corrected, it's saying exactly what I've been saying.
Like I said, you just don't understand this stuff, and don't want to.

Austin


> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of dickbo
> Sent: Monday, June 10, 2002 3:42 PM
> To: darkroom@ix.netcom.com
> Subject: [filmscanners] Re: Density vs Dynamic range
>
>
> Nice one Cyril
>
> ----- Original Message -----
> From: "Shough, Dean" <dean.shough@lmco.com>
> To: <dickbo@btopenworld.com>
> Sent: Monday, June 10, 2002 7:11 PM
> Subject: [filmscanners] RE: Density vs Dynamic range
>
>
> ... I'd like to follow this through to a definitive source.
> >
>
> 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
>
> They go on to define a standard method for defining the signal to noise
> ratio using the concept of incremental gain.  Incremental gain allows the
> signal to noise ratio to be determined independent of gamma.

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