[sane-devel] Fwd: verticle stripes in high res scans

Christopher Marshall christopherlmarshall@yahoo.com
Mon, 15 Mar 2004 06:15:45 -0800 (PST)

I had sent this during the down period.

Here it is again.

I have done some more experimenting with using the GIMP's destriping filter, which seems to work
very nicely.  I'd still like to understand why it happens though.

Chris Marshall

--- Christopher Marshall <christopherlmarshall@yahoo.com> wrote:
> Date: Mon, 8 Mar 2004 07:29:11 -0800 (PST)
> From: Christopher Marshall <christopherlmarshall@yahoo.com>
> Subject: verticle stripes in high res scans
> To: sane-devel@lists.alioth.debian.org
> I have a CanoScan LiDE 80 that I have been happily using with SANE for a few months now.
> I have noticed verticle stripes or bands of brightness and darkness when I scan photos at high
> res.
> I'm taking a small photo and scanning it at high res.
> Does anyone know what causes this or how to combat it?
> I see that the Gimp has a destripe filter written specifically for this problem.
> Is post-processing with a destriping filter the way a windows driver would handle this problem?
> Perhaps a better question would be: how much of the difference in quality between default SANE
> scans and scans done with the windows driver (for the same scanner) are due to simple
> post-processing steps that can be done with GIMP like programs?
> Chris Marshall

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