V500 and Vuescan , ICE setup

[Emmanuel]

Hi,

I just bought a V500 and I don't see any difference with/without ICE
for avoiding dust , with vuescan.
With ICE I get a lot of artefact.
Setup is bits/pixel auto - infrared cleaner highest - 8.5.38 vuescan

Thank you for help

--
Emmanuel - http://ebgy.ath.cx

[-]

What type of film are you scanning? FWIW, ICE does not work on traditional
b/w film and some versions of Kodachrome.

Doug
--
www.BetterScanning.com - Custom Film Holders and Accessories for Agfa,
Microtek and Epson Scanners

"Emmanuel" <eb...@altern.org> wrote in message
news:hda1m7$30nv$1...@talisker.lacave.net...

[Emmanuel]

> What type of film are you scanning? FWIW, ICE does not work on traditional
> b/w film and some versions of Kodachrome.

It is traditionnal B&W film (HP5+)
Is it normal it works with antidust filter?

[Nigel Feltham]

Emmanuel wrote:

>> What type of film are you scanning? FWIW, ICE does not work on
>> traditional b/w film and some versions of Kodachrome.
>
>
> It is traditionnal B&W film (HP5+)
> Is it normal it works with antidust filter?

The ICE technology works by scanning with infrared light as well as the
normal scanner light. The Dyes used for the image in Normal Colour film
(both negative and slide/transparency) is transparent to infrared light so
the only thing blocking that light is dust and scratches.

This creates a map of the defects that the driver or application on the
computer use to recreate the damaged areas from the surrounding area
(basically copying an average of the colour both sides of the damage into
the damaged area).

Unfortunately Traditional film uses silver crystals instead of a chemical
Dye and this blocks all light including the infrared so the ICE circuit
sees the same image as the normal white light and cannot use it to remove
defects - as the ICE scan contains a copy of the film image the driver gets
confused and thinks the image is a fault that needs correction and causes
the artifacts you are seeing.

Kodachrome has similar problems - though not so severe as the image only
partially blocks the infrared beam so dust is seen darker than the real
image and clever filtering can enable ICE to still work on better scanner
software (like Vuescan or current generation of Nikon scanner drivers).

The only way to remove DUST on B/W film is to use compressed air to blow it
off the film before scanning - or use photo editing software to remove it
manually. I'm not sure how well ICE would cope with the few DYE based B/W
films available though (the type that are processed in Colour Negative
chemicals) as these may scan with ICE the same as colour film.