7600i color stability

All the problems with Plustek film scanners

bframe5
Visitor
Posts: 2
Joined: Mon Oct 11, 2010 5:59 pm
Scanner: Plustek OpticFilm 7600i

7600i color stability

Postby bframe5 » Mon Oct 11, 2010 6:28 pm

Has anyone had any issues with color stability?
If I scan the same shot multiple times, the color changes with every scan.
This makes it very difficult to use this scanner to process rolls of film shot in controlled lighting conditions, where color consistency is necessary. :(

For the testing I disabled everything that I possibly could.

Film: Kodak Portra 400 VC
No dust removal/correction.
No negafix or CCR applied.
No other corrections.

Test-1.png
Test 1
Test-1.png (130.35 KiB) Viewed 1815 times

This was scanned at 1:43AM. (Converted to PNG for forum uploading.)

Test-2.png
Test 2
Test-2.png (130.4 KiB) Viewed 1815 times

This was scanned at 1:44AM. (Converted to PNG for forum uploading.)

Histogram.jpg
Lightroom3 histogram
Histogram.jpg (57.73 KiB) Viewed 1815 times


Here you can see that the Lightroom3 histograms are VERY different.
Any ideas? Should I be sending in my scanner for warranty repair/replacement?

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LSI_Ketelhohn
LSI Staff
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Posts: 4283
Joined: Wed May 28, 2008 11:19 am
Scanner: all
Location: Kiel, Germany
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Re: 7600i color stability

Postby LSI_Ketelhohn » Mon Oct 18, 2010 8:56 am

Dear customer,

was the device at a constant temperature when you made these scanns?
It takes about 20 min of contious scanning to reach the final color values of a scanner.
I assume the scan frame did not change?
Did you deactivate the CCR and auto functions in NegaFix?
(in an Ai version the "auto" selector is located in the advanced NegaFix settings)

kind regards,
Arne Ketelhohn.

bframe5
Visitor
Posts: 2
Joined: Mon Oct 11, 2010 5:59 pm
Scanner: Plustek OpticFilm 7600i

Re: 7600i color stability

Postby bframe5 » Fri Oct 22, 2010 6:18 pm

Thanks for the reply!

I tried scanning for 1 hour straight, and the colors stabilized after around 30 minutes.
I'm happy that the colors are correct, but a bit disappointed that a LED-based film scanner takes 30 minutes to stabilize.

LSI_Morales
SilverFast Master
SilverFast Master
Posts: 1430
Joined: Mon Oct 22, 2007 9:33 am

Re: 7600i color stability

Postby LSI_Morales » Mon Oct 25, 2010 8:17 am

Dear bframes

all scanners change temperature, especially when you start it after hours of not being used. Apart from this fact, scanners can not produce exactly the same result because the amount of electricity and the pixels are not always the same in the same position, these variations produce the subtle differences you have observed.
The best way to achieve similar results is by doing the scans after achieving the optimal working temperature of your device. Constant scanning after this temperature has been achieved also helps.
If you have your device close to a source of fresh air, this might also produce temperature changes which might affect your scanner.

Cheers
Alejandro Morales

LaserSoft Imaging
Media manager, Software testing


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