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<!-- received="Sun Jan 3 11:09:25 1999 PST" -->
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<!-- sent="Sun, 3 Jan 1999 19:23:00 +0100" -->
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<!-- name="Robert Brink" -->
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<!-- email="linux4me@dds.nl" -->
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<!-- subject="Re: slow , mustek , se , scanexpress, lock" -->
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<!-- id="99010320074600.00350@petteflet" -->
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<!-- inreplyto="slow , mustek , se , scanexpress, lock" -->
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<title>sane-devel: Re: slow , mustek , se , scanexpress, lock</title>
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<h1>Re: slow , mustek , se , scanexpress, lock</h1>
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<b>Robert Brink</b> (<a href="mailto:linux4me@dds.nl"><i>linux4me@dds.nl</i></a>)<br>
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<i>Sun, 3 Jan 1999 19:23:00 +0100</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#31">[ date ]</a><a href="index.html#31">[ thread ]</a><a href="subject.html#31">[ subject ]</a><a href="author.html#31">[ author ]</a>
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<li> <b>Next message:</b> <a href="0032.html">Guy G. Sotomayor: "Re: Problems compiling"</a>
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<li> <b>Previous message:</b> <a href="0030.html">Michael J Surette: "Scantak-12P + Re: Problems compiling"</a>
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<li> <b>Next in thread:</b> <a href="0147.html">Bas Vermeulen: "Re: slow , mustek , se , scanexpress, lock"</a>
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<li> <b>Next in thread:</b> <a href="0044.html">a.bolsch@ic.ac.uk: "Re: slow , mustek , se , scanexpress, lock"</a>
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<li> <b>Reply:</b> <a href="0044.html">a.bolsch@ic.ac.uk: "Re: slow , mustek , se , scanexpress, lock"</a>
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<li> <b>Reply:</b> <a href="0147.html">Bas Vermeulen: "Re: slow , mustek , se , scanexpress, lock"</a>
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<!-- reply="end" -->
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</ul>
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<!-- body="start" -->
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On Sun, 03 Jan 1999, Aglef Kaiser <<a href="mailto:kaiser@prostep.de">kaiser@prostep.de</a>> wrote:<br>
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<p>
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<i>>I have the same problem with Mustek Paragon 1200SP and a NCR53C810 SCSI controler. Grey</i><br>
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<i>>scan is faster or has the same speed as TWAIN and color scans may be make for each line</i><br>
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<i>>a step back and is many times slower than M$ TWAIN.</i><br>
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<p>
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I think it is quite clear this backtracking has not been caused by the SCSI<br>
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controller. Three types of controllers have been tested by me and other entrants<br>
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in this mailing list:<br>
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1. the supplied NCR53c400a ISA controller w/o IRQ<br>
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2. the suggested NCR53c810 PCI controller, with IRQ and bus-mastering DMA<br>
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3. an Adaptec AVA-1505 ISA controller, with IRQ, but without DMA<br>
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<p>
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All SCSI controllers work with SANE and the mustek backend to control a Mustek<br>
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scanner, but still there is this issue of backtracking and hence, slow scanning<br>
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compared to Windows and TWAIN.<br>
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<p>
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Now I think SANE and backtracking has two probable causes:<br>
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1. The driver (i.e. mustek backend) sends a strange command which confuses the<br>
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scanner.<br>
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2. The driver deliberately uses backtracking, to ensure image quality<br>
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(no dropped lines etc.)<br>
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<p>
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I still hope to find the answer somewhere, as I can't figure out where it is<br>
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being done in the mustek backend, nor can I find some configurable option to<br>
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disable backtracking. Unchecking the "Force backtracking" box in xscanimage has<br>
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only effect in grayscale and lineart scans.<br>
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<p>
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Cheers,<br>
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<p>
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Robert<br>
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<a href="mailto:linux4me@dds.nl">linux4me@dds.nl</a><br>
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<p>
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<pre>
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--
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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">majordomo@mostang.com</a>
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0032.html">Guy G. Sotomayor: "Re: Problems compiling"</a>
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<li> <b>Previous message:</b> <a href="0030.html">Michael J Surette: "Scantak-12P + Re: Problems compiling"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0147.html">Bas Vermeulen: "Re: slow , mustek , se , scanexpress, lock"</a>
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<li> <b>Next in thread:</b> <a href="0044.html">a.bolsch@ic.ac.uk: "Re: slow , mustek , se , scanexpress, lock"</a>
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<li> <b>Reply:</b> <a href="0044.html">a.bolsch@ic.ac.uk: "Re: slow , mustek , se , scanexpress, lock"</a>
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<li> <b>Reply:</b> <a href="0147.html">Bas Vermeulen: "Re: slow , mustek , se , scanexpress, lock"</a>
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<!-- reply="end" -->
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</ul>
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