[rollei_list] Re: Trying to restore Kodachromes taken 50 years ago
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 6 Aug 2014 19:49:36 -0300
2014-08-06 16:06 GMT-03:00 Hauke Fath <hauke@xxxxxxxxxxxxxxxxxxxxxxxx>:
>...
> I am mildly puzzled - for all I know, the infrared-based dust correction
> algorithms are not supposed to work with Kodachrome, since its silver layer
> (just like traditional b/w film) is not transparent in infrared, unlike the
> dyes of colour slides.
Hauke:
Kodachrome slides make more difficult IR cleaning due to
some dyes tending to block the IR light, however they are not like the
B&W negs that block the IR light completely. It must be the reason
Digital ICE almost does not work on "my" Kodachromes as I wrote
previously; however Vuescan has three IR cleaning modes: Light, Medium
and Heavy, I'm using the Heavy mode, it causes some image softening
but it works pretty well;It is not perfect BTW, it does not remove
100% of scratrches and spots, I'd say a 70 to 75%. Vuescan does two
passes, the first time it scans the image, the second time it creates
an almost white and bright layer on the scanned image where you see
projected the scratches and spots it will remove from the image, when
the final result appears, it looks free regarding those spots and
scratches. i.e., one of the Kodachromes has a car with some very
visible spots, Digital ICE only reduced their size slightly, but
Vuescan eliminated them completely, the price is image softening, but
the results-cost relationship is very good; anyway Vuescan IR leaves
some spots in the sky specially.
Carlos
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