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<!-- received="Mon May 12 19:12:49 1997 MST" -->
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<!-- sent="Tue, 13 May 1997 00:33:47 +0200 (MET DST)" -->
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<!-- name="becka@sunserver1.rz.uni-duesseldorf.de" -->
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<!-- email="becka@sunserver1.rz.uni-duesseldorf.de" -->
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<!-- subject="Re: Mustek Scanner distorted image lines" -->
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<!-- id="m0wR3f9-000BVUC@charon.beck-sw.de" -->
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<!-- inreplyto="Pine.LNX.3.95.970512220948.9346A-100000@moria.informatik.uni-bonn.de" -->
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<title>sane-devel: Re: Mustek Scanner distorted image lines</title>
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<h1>Re: Mustek Scanner distorted image lines</h1>
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<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de"><i>becka@sunserver1.rz.uni-duesseldorf.de</i></a><br>
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<i>Tue, 13 May 1997 00:33:47 +0200 (MET DST)</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#143">[ date ]</a><a href="index.html#143">[ thread ]</a><a href="subject.html#143">[ subject ]</a><a href="author.html#143">[ author ]</a>
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<li> <b>Next message:</b> <a href="0144.html">David Mosberger-Tang: "Re: no mustek device - MFS6000SP"</a>
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<li> <b>Previous message:</b> <a href="0142.html">Thomas Blume: "Mustek - Speed - Buffer"</a>
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</ul>
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<!-- body="start" -->
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<i>> - 128k SCSI buffer</i><br>
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<p>
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<i>> The scanner is a MFS-12000SP which says</i><br>
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<i>> Host: scsi1 Channel: 00 Id: 06 Lun: 00</i><br>
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<i>> Vendor: SCANNER Model: Rev: 1.00</i><br>
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<i>> Type: Scanner ANSI SCSI revision: 01 CCS</i><br>
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Here I have :<br>
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<p>
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Vendor: MUSTEK Model: MFS-12000SP Rev: 1.00<br>
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Type: Scanner ANSI SCSI revision: 01<br>
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<p>
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<i>> The problem is that about every 128kBytes in the image 1 or two scan</i><br>
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<i>> lines of garbage seem to be added (I think sometimes lines are</i><br>
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<i>> missing, too).</i><br>
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This is probably due to a bad color-correction scheme. I added an alternate<br>
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scheme for my scanner which doesn't use backtracking, but sends R,G,B at<br>
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1/72" offset. The correction code influences particularly the start and<br>
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end of a complete SCSI Buffer. Please check out, if the following section<br>
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of code gets activated for you :<br>
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<p>
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/* Revision 1.00 of the MFS-12000SP firmware is buggy and needs<br>
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this workaround. Maybe others need it too, but this one is<br>
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for sure. We know for certain that revision 1.02 or newer<br>
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has this bug fixed. */<br>
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if (fw_revision < 0x102)<br>
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dev->flags |= MUSTEK_FLAG_LD_MFS;<br>
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<p>
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Then change it to be (de-)activated depending on what was the state before.<br>
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<p>
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I suppose this should correct the problem. please report what happened, so <br>
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we can add auto-detection. MUSTEK should be shot for not counting up <br>
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Firmware-Revision ...<br>
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<p>
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<i>> The distorted lines also appear in modes other than Color. I'm pretty</i><br>
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<i>> sure (90%) that I had a similar distortion when I once had the scanner</i><br>
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<i>> connected to the NCR53C400 card.</i><br>
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This shouldn't happen. Please check, if 10% are the case ;-)<br>
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The correction code which is the most probable cause, is only activated in<br>
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color mode.<br>
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<p>
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CU,Andy<br>
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<p>
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<pre>
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--
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Andreas Beck | Email : <<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de">becka@sunserver1.rz.uni-duesseldorf.de</a>>
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=== World-Wide-Web URL : <a href="http://sunserver1.rz.uni-duesseldorf.de/~becka">http://sunserver1.rz.uni-duesseldorf.de/~becka</a> ===
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<p>
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<pre>
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--
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</pre>
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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="0144.html">David Mosberger-Tang: "Re: no mustek device - MFS6000SP"</a>
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<li> <b>Previous message:</b> <a href="0142.html">Thomas Blume: "Mustek - Speed - Buffer"</a>
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</ul>
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