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<TITLE>sane-devel: Re: Problem with scan quality using UMAX Astra 1220S</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="Re: Problem with scan quality using UMAX Astra 1220S">
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<H1>Re: Problem with scan quality using UMAX Astra 1220S</H1>
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<!-- received="Fri Nov 3 15:14:44 2000" -->
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<!-- sent="Sat, 04 Nov 2000 00:19:12 +0100" -->
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<!-- isosent="20001103231912" -->
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<!-- name="Oliver Rauch" -->
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<!-- email="oliver.rauch@Wolfsburg.DE" -->
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<!-- subject="Re: Problem with scan quality using UMAX Astra 1220S" -->
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<!-- id="3A0347F0.AF80452B@wolfsburg.de" -->
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<!-- inreplyto="20001103234936.A1028@utanet.at" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%20Problem%20with%20scan%20quality%20using%20UMAX%20Astra%201220S&In-Reply-To=<3A0347F0.AF80452B@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Nov 03 2000 - 15:19:12 PST
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<P>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0046.html">Andrew Bulmer: "hp scanjet 5p with sym53c416 takes a long time"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0044.html">Rod Pike: "Problem with scan quality using UMAX Astra 1220S"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0044.html">Rod Pike: "Problem with scan quality using UMAX Astra 1220S"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0079.html">Rod Pike: "Re: Problem with scan quality using UMAX Astra 1220S"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0079.html">Rod Pike: "Re: Problem with scan quality using UMAX Astra 1220S"</A>
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<HR NOSHADE><P>
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<!-- body="start" -->
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<P>
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Rod Pike wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Greetings,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I'm running RH 6.2 and using the supplied version of Gimp and sane-1.0.1-4. I
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</EM><BR>
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<EM>> have a problem getting output from this combination that comes close to the
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</EM><BR>
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<EM>> quality of the output I get using the supplied Windows Twain interface (
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</EM><BR>
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<EM>> VistaScan ) that came with my UMAX Astra 1220S.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> The problem is difficult to explain but if you look at these jpegs I think you
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</EM><BR>
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<EM>> can see what I mean. There is a faint line of pixels on the xscanimage
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</EM><BR>
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<EM>> captured image and it's hard to see here but the uniformaty of the pixels on
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</EM><BR>
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<EM>> the vistascan captured image is much smoother than that of xscanimage.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> <A HREF="http://www.iosphere.net/~sullivan/rp/sane/vistascan300dpiRGBcrop.jpg">http://www.iosphere.net/~sullivan/rp/sane/vistascan300dpiRGBcrop.jpg</A>
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</EM><BR>
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<EM>> <A HREF="http://www.iosphere.net/~sullivan/rp/sane/xscanimage300dpiRGBcrop.jpg">http://www.iosphere.net/~sullivan/rp/sane/xscanimage300dpiRGBcrop.jpg</A>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Both images are scanned using the same source at 300 dpi. I've used whatever
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</EM><BR>
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<EM>> default settings there are with each interface.
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Hi Rod,
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<BR>
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<P>this looks like a problem of your scsi bus or drivers.
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<BR>
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<P>Here is a part of the xsane helpfiles:
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<BR>
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<P> The scanner starts the scan but it stops while scanning
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<BR>
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The scsi bus or the whole system freezes
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<BR>
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The image is corrupted
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<BR>
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<P><P> In general there are three different reasons that can cause such erros:
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<BR>
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<P> In most cases it is a problem with your scsi bus. Please check the following points:
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<BR>
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<P> The scsi bus has to be a chain (one line) that is terminated on both ends. If possible the
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<BR>
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scanner should be on one end of the chain because the connectors on most scsi
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<BR>
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scanners are not specified for the scsi-2 standard.
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<BR>
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If you do not use any ultra-scsi-devices and your scsi controller is a fast scsi
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<BR>
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controller you can use passive terminators. If one or more devices are
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<BR>
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ultra-scsi-devices you have to use active terminators.
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<BR>
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If the scsi controller is at an end of the scsi chain the termination of the controller has
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<BR>
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to be enabled. Otherwise it has to be disabled. If you use a fast scsi controller and you
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<BR>
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have one or more ultra-scsi-devices connected, you must not use the built in
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<BR>
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termination of the scsi controller (because it is a passive terminator), you have to use
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<BR>
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an active terminator instead.
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<BR>
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The length of the scsi chain is limitted. If you use no ultra-scsi-devices the whole
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<BR>
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length of the chain must not exceed 3 meters. If there are one or more
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<BR>
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ultra-scsi-devices in the scsi chain the length of the chain must not exceed 1.5
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<BR>
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meters. If there are only 3 devices (2 devices + controller) the length of the chain
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<BR>
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may be up to 3 meters, but if you have any problems you should try to reduce the
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<BR>
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length.
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<BR>
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<P> The driver for your scsi controller does not work like expected. Update your scsi driver if you do not
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<BR>
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have the most recent version.
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<BR>
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If that does not help try it with an other type of scsi card.
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<BR>
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<BR>
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May be your scanner/firmware does not work correct with the backend you use. Update the
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<BR>
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backend version or contact the author of the backend.
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<BR>
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<P><P>May be that helps
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<P><PRE>
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--
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Homepage: <A HREF="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</A>
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sane-umax: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-umax.html">http://www.wolfsburg.de/~rauch/sane/sane-umax.html</A>
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xsane: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@Wolfsburg.DE?Subject=Re:%20Problem%20with%20scan%20quality%20using%20UMAX%20Astra%201220S&In-Reply-To=<3A0347F0.AF80452B@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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<P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Problem%20with%20scan%20quality%20using%20UMAX%20Astra%201220S&In-Reply-To=<3A0347F0.AF80452B@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0046.html">Andrew Bulmer: "hp scanjet 5p with sym53c416 takes a long time"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0044.html">Rod Pike: "Problem with scan quality using UMAX Astra 1220S"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0044.html">Rod Pike: "Problem with scan quality using UMAX Astra 1220S"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0079.html">Rod Pike: "Re: Problem with scan quality using UMAX Astra 1220S"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0079.html">Rod Pike: "Re: Problem with scan quality using UMAX Astra 1220S"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Fri Nov 03 2000 - 15:15:18 PST</EM>
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