Differences in IR channel

All the problems with Nikon film scanners

havanna200
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Joined: Sat Apr 25, 2015 2:00 pm
Scanner: Nikon5000ED
SilverFast Product: Ai Studio

Differences in IR channel

Postby havanna200 » Sat Apr 25, 2015 2:07 pm

I use 3 scanners, Nikon5000ED. One of them creates sometimes pixalated or unsharp pictures with ISRD.
Reason seems to be wrong scan or interpretation of the IR channel.
This scanner does not have problems with Nikonscan, just with SF8.2.

Here an example of the same picture in 3 scanners.
Scanner 2 creates the pixalated pictures and shows a strange IR channel (in red the marked defects).

infrared3.jpg
infrared3.jpg (197.53 KiB) Viewed 1006 times


Any idea about the reason?

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LSI_Ketelhohn
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Joined: Wed May 28, 2008 11:19 am
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Re: Differences in IR channel

Postby LSI_Ketelhohn » Thu Apr 30, 2015 4:31 pm

Dear customer,

The infrared channel of your second scanner is not able to penetrate the emulsion.
As you can see the entire "hair area" is detected as a defect.
That causes the pixilation you see because iSRD is trying to correct the entire area.

Have you tried reducing the detection value in iSRD?
The expert settings of iSRD could also help to compensate this.

This could be caused by the aging of the lamp.

Kind regards,
Arne Ketelhohn.


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