[filmscanners] RE: scanner dmax discussion

["Chuck Cole" <cncole@earthlink.net>]

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Paul D. DeRocco
> Sent: Wednesday, July 16, 2003 12:34 PM
> To: cncole@earthlink.net
> Subject: [filmscanners] RE: scanner dmax discussion
>
>
> > From: filmscanners_owner@halftone.co.uk
> >
> > This is just not an accurate statement: silicon (and similar)
> > photoconductive photosensors are about the most linear of all
> > detectors, and
> > little else is used these days.  One elegant variety of
> ccd-like sensor is
> > strictly linear to within better than 0.1% over about 9 decades of light
> > level.  Nearly all non-linearities and most noise effects are introduced
> > after the detectors and are minimal effects.
>
> You mean nine octaves, don't you?
>
> --
>
> Ciao,               Paul D. DeRocco
> Paul                mailto:pderocco@ix.netcom.com


No: decades as in 90dB power range... ten to the ninth power.  An octave is
only a factor of two...  1::512 is very much smaller.


Regards,

Chuck



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