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[OM] Re: Okay, let's talk about film ........

Subject: [OM] Re: Okay, let's talk about film ........
From: "Carlos J. Santisteban Salinas" <cjss@xxxxxxxxxxxxx>
Date: Sun, 2 May 2004 12:17:25 +0200
Hi, Fernando, Walt and all.

>And I don't know the technical reason why ICE doesn't work with Kodachrome.
>They just say it doesn't.  Maybe somebody else around here knows why.  They
>also say it doesn't work with silver-based film either, but I don't see a
>connection there.

AFAIK, ICE works on an infrared image of the film, because 'chromogenic'
films (those which make the image out from dyes, instead of silver grains)
are transparent to IR light, but the dust etc is *not*, so the software is
aware of *where* the dust is.

All colour negative films and most slides (all except Kodachrome) are
chromogenic, thus suitable for ICE. This is true also of C41 processed B&W
films (Ilford XP2, etc). But both 'conventional' B&W films and the
Kodachromes make the image from silver grains (instead of dyes), which are
opaque to IR, thus rendering ICE useless.

Enjoy,

...

Carlos J. Santisteban

<cjss@xxxxxxxxxxxxx>
<http://cjss.galeon.com>



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