Infrared chanel shift

flatbed scanners for Canon

victorg
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Posts: 1
Joined: Fri Jan 30, 2015 10:32 am
Scanner: Canoscan 9000f markii
SilverFast Product: Ai

Infrared chanel shift

Postby victorg » Fri Jan 30, 2015 12:09 pm

Hi all!!!
I'm using canoscan 9000f markii with silferfast ai 8
Then i scan pos/neg film appears streching of ir channel? i.e on left side of scan mask covers scratch & dust, at center mask shifting right about 1mm, on right side it shifts about 2mm.
Canon software scans fine, so i dont think its scanner hardware problem
Image
Left side

Image
Right side

Image
scan

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LSI_Ketelhohn
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Re: Infrared chanel shift

Postby LSI_Ketelhohn » Thu Feb 05, 2015 5:02 pm

Dear customer,

You are using an old/outdated version.
Please update to the latest SilverFast version through our download/update page.
Also make sure the latest Canon drivers are installed.

Kind regards,
Arne Ketelhohn.

ian_m
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Posts: 2
Joined: Mon Mar 21, 2016 11:32 am
Scanner: Canoscan 9000F MK II
SilverFast Product: SE Plus

Re: Infrared chanel shift

Postby ian_m » Thu Mar 24, 2016 12:08 pm

I too am seeing an IR offset with SilverFast SE Plus on Canon Canonscan 9000F MKII on negatives.

Have reported to to support, but disappointingly heard nothing. Such a shame as renders scanner and software no good.

This is what I am seeing an offset between scanned RGB and IR channels.

Image

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LSI_Ketelhohn
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Re: Infrared chanel shift

Postby LSI_Ketelhohn » Wed Mar 30, 2016 12:34 pm

Dear customer,

Please try adjusting the maximum offset for the iSRD alignment in the preferences' special tab.

Kind regards,
Arne Ketelhohn.

ian_m
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Posts: 2
Joined: Mon Mar 21, 2016 11:32 am
Scanner: Canoscan 9000F MK II
SilverFast Product: SE Plus

Re: Infrared chanel shift

Postby ian_m » Mon Apr 04, 2016 10:34 pm

Did that, adjusted maximum offset in iSRD settings and made no difference.

Currently open with SilverFast support.

mszargar
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Posts: 2
Joined: Fri Aug 01, 2014 4:35 pm
Scanner: Epson v750
SilverFast Product: Ai
SilverFast Version: 6.6

Re: Infrared chanel shift

Postby mszargar » Sun May 21, 2017 10:16 am

The problem is that offset correction doesn't help. I have been playing with raw files out of 9000f using SANE, and I have noticed that I need a full transformation, including a resize and a shift, to superpose the artifacts in the image and their IR record. Trying to get to a perfect superposition by only shifting is impossible, and that is why even setting the maximum value in SF settings is ultimately useless.

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LSI_Ketelhohn
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Re: Infrared chanel shift

Postby LSI_Ketelhohn » Fri May 26, 2017 3:09 pm

That is correct the infrared and RGB images have different ratios and sizes. However that is already a part of SilverFasts adjustments.
The setting in SilverFast does take all that into account.
Have you also tried lower settings? That can avoid "false friends" detection.

Kind regards,
Arne


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