[filmscanners] Re: Software dust removal

["" <jphipps@kodak.com>]

Dieder--
Have you tried the same experiment with Digital ICE set in the "Normal"
setting rather than "Fine"? I find virtually no image information when I
do a difference between a "No Digital ICE" scan and a "Normal Digital ICE"
scan.

I have been looking for some Nikon documentation on when to use "Normal"
and when to use "Fine". So far I haven't found any. Do you have any
information?

Jack Phipps
Kodak's Austin Development Center
Formerly, Applied Science Fiction
Developers of Digital ICE, Digital ROC, Digital SHO, Digital GEM, Digital
GEM Airbrush




>I suggest you look for any detail removed with Digital ICE because there
>will probably not be any detail removed. The reason the image may look
>less sharp is because the eye is being tricked by the surface defects
>(dust, scratches, etc.). There shouldn't be any residual silver in C-41
>processed film. The reason the eye is "tricked" is because the eye is
>looking for the finest detail in the image to judge sharpness. In many
>cases the finest details are the surface defects. When those are removed
>the image appears less sharp when actually the image detail remains.

A simple test can provide the additional confirmation/refutation of this.

Scan a negative with a film scanner that can do precise line repeat
scanning,
i.e. a film-scanner such as the LS-4000 etc.

Do one scan with ICE on 'fine', another without 'ICE'

pop both images into Photoshop. Superimpose one as a layer against the
other
and do a 'difference' mode for the layers.

Images w/o ICE are noticeably sharper, though more dirty. For myself, it
isn't that much of an issue except for a few scans so by default I use
ICE,
but for the most imp't scans, I don't use ICE and do scratch/detail repair
by
hand.



Dieder

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