[sane-devel] Re: Weird vertical stripes on Microtek ScanMakerX12USL (sane-1.05)

[Karsten Festag]

Hi,

I am currently try to solve the problems with the X12USL. The colored stripes
look somewhat similar on all devices so I think it is not a hardware problem.
What I urgently need is a log of the data that is transferred via SCSI when
scanning with the windows (or Mac?) driver. I managed this for my scanner by
using a patched version of wine running the original windows drivers and Levente
Novak managed this for his scanner too. I don't know what is possible on a Mac,
but if you have an idea, please let me know! There seems to be a growing
interest in sopport of the X12USL, so it will be worth the work.

Regards

Karsten



Novak Levente wrote:

> On Sun, 11 Nov 2001, Michael Thomson wrote:
>
> > Hi Henning
> >
> > Thanks for your tips - I've successfully built & installed
> > sane-backends-1.06 and sane-frontends-1.06 as well as xsane-0.80 now.
> >
> > Sadly I'm still getting weird stripes, but I found a previous discussion on
> > this and I've mailed the folk involved to see if they made any progress.
> >
> > To answer your question, sane-1.05 came precompiled with my distribution:
> > Yellow Dog Linux 2.1 from Terrasoft (www.yellowdoglinux.com)
> >
>
> Usually if you get vertical stripes in scanned images, it means that there
> is no (or there is a wrong type of) shading correction. Every CCD or CIS
> is composed of photoelements slightly different in characteristics, so
> usually the scanned images are not directly converted to images but
> corrected for lamp and sensor unevenness.
> I had similar problems with Microtek Phantom 636cx, until Karsten Festag
> corrected the shading function in microtek2. Since then, everything is
> working fine.
> The only strange thing in your image is that the stripes are not dark like
> in my case but coloured. It seems to me it is a wrong (buggy?) shading
> correction rather than a non-existant one. Or a communication problem
> between the scanner and the computer which corrupts the data?
>
> Levente
>
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