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<H1>Re: please advise: Mustek 12000SP, NCR810 &amp; color stripes</H1>
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20please%20advise:%20Mustek%2012000SP,%20NCR810%20&amp;%20color%20stripes&In-Reply-To=&lt;20010121122559.A7719@vortex.swb.de&gt;"><EM>hmg-ml@gmx.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Sun Jan 21 2001 - 03:25:59 PST
<P>
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Hi,
<BR>
<P>On Sun, Jan 21, 2001 at 09:37:34AM +0100, FJA van Zijp wrote:
<BR>
<EM>&gt; Yikes. I think I got a severe case of coloredstriperitis.
</EM><BR>
<P>:-)
<BR>
<P><EM>&gt; Scanned color images show horizontal lines, one pixel high. The
</EM><BR>
<EM>&gt; colors of these lines are clearly off. They seem to lack one or two of
</EM><BR>
<EM>&gt; the RGB components.
</EM><BR>
<P>From your image it looks like they occur at the border between two
<BR>
scan buffers (64k). You may check this by setting option buffersize to
<BR>
something other than 128 (the standard size, its twice as much as
<BR>
actually sent from the scanner). If the lines occur more towards the
<BR>
bottom of the image with bigger buffers, it's probably a problem
<BR>
related to sending/receiving these buffers not fast enough.
<BR>
<P><EM>&gt; I'm not sure if these are the horizontal stripes that are mentioned in
</EM><BR>
<EM>&gt; the SANE literature,
</EM><BR>
<P>It's one possibility for stripes. It doesn't look like a line distance
<BR>
problem, however.
<BR>
<P><EM>&gt; because I only saw one example on the Mustek
</EM><BR>
<P><EM>&gt; I have a Mustek ScanExpress 12000SP (says the cover) with
</EM><BR>
<EM>&gt; firmware 2.02 (says SANE).
</EM><BR>
<P>Same here.
<BR>
<P><EM>&gt; The scanner is tied to a nameless
</EM><BR>
<EM>&gt; NCR810 SCSI card, no other SCSI devices are involved.
</EM><BR>
<P>I have also some sort of NCR810 Clone but at the moment I'm using an
<BR>
Adaptec 2940. I will try the 810 later. I'm using the following option
<BR>
in modules.conf:
<BR>
<P>options ncr53c8xx ncr53c8xx=&quot;disc:n&quot;
<BR>
<P>But I don't think it will change anything.
<BR>
<P><EM>&gt; Slackware 7.1, kernel 2.2.17 drives the linux box, ncr53c7,8xx.o
</EM><BR>
<EM>&gt; drives the card. SANE 1.0.4 with Mustek backend 1.0.4 compiles
</EM><BR>
<EM>&gt; flawlessly - BTW I only compile the backends mustek and v4l to save
</EM><BR>
<EM>&gt; time.
</EM><BR>
<P>Here it's 2.2.18. I can't reproduce the stripes but will try later
<BR>
with the other card.
<BR>
<P>The debug log doesn't look unusual. Can you send a debug log of an
<BR>
actual scan (with stripes) to me directly (not the list)?
<BR>
<P>Something like
<BR>
<P>SANE_DEBUG_MUSTEK=5 SANE_DEBUG_SANEI_SCSI=255 scanimage -d \
<BR>
&nbsp;&nbsp;mustek:/dev/scanner your options here 2&gt;dbg.log
<BR>
&nbsp;&nbsp;
<BR>
Bye,
<BR>
&nbsp;&nbsp;Henning
<BR>
<P><PRE>
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