[filmscanners] Re: NikonScan problem

["Arthur Entlich" <artistic-1@shaw.ca>]

I suggest anyone who has flamed me in the past about my commentary on
Nikon scanners earmark this posting of mine, so that it can be easily
referred back to. ;-)

I'm actually going to "sort of" defend Nikon.

Many of the cold cathode tubes used in film and flatbed scanners also
have incomplete spectra, in fact, they have fairly specific RGB hills
and valleys.  They are less sharp than what an LED light source would
produce, but they too are not complete spectrum, in part intentionally,
and in part due to certain deficiencies in cold cathode technology.

Art

David J. Littleboy wrote:

> "Paul D. DeRocco" <pderocco@ix.netcom.com> writes:
>
> I've managed to coax decent "raw material" Kodachrome scans out of the
> scanner by selecting the Scanner RGB color space (which disables
> conversion), setting the gamma to about 2 in the Curves box, and then
> setting analog gain to R=1.5, G=0.5, B=0. I'm still mystified why I never
> had this problem before, but at least I'm up and running. I've also ordered
> a Kodachrome IT8 target slide, so as soon as that arrives, I'm going to try
> profiling the scanner with those analog gain settings.
> <<<<<<<<<<<<<
>
> There's a discussion (ugly flame war, actually) going on about this on the
> usenet scanners list right now. The claim is that the Nikon light sources
> are monochromatic, so only measure the spectral responses of the dyes at
> three points. The further claim is that Kodachrome dyes have _average_
> spectral responses that do the right thing, but that the details of the
> spectral response are such that there are strong valleys and peaks, and that
> those valleys and peaks vary from batch to batch. So the Nikon scanners can
> have wildly different responses to different batches of Kodachrome.
>
> Sounded sensible and possible, but I've never shot Kodachrome...
>
> David J. Littleboy
> davidjl@gol.com
> Tokyo, Japan
>


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