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<!-- received="Wed Aug 6 23:35:01 1997 MST" -->
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<!-- sent="Wed, 6 Aug 1997 22:39:38 +0200 (MET DST)" -->
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<!-- name="Rogier Wolff" -->
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<!-- email="R.E.Wolff@BitWizard.nl" -->
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<!-- subject="Re: COOLSCAN II backend" -->
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<!-- id="199708062039.WAA01815@cave.BitWizard.nl" -->
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<!-- inreplyto="199708061301.JAA17765@nigel.redhat.com" -->
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<title>sane-devel: Re: COOLSCAN II backend</title>
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<h1>Re: COOLSCAN II backend</h1>
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<b>Rogier Wolff</b> (<a href="mailto:R.E.Wolff@BitWizard.nl"><i>R.E.Wolff@BitWizard.nl</i></a>)<br>
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<i>Wed, 6 Aug 1997 22:39:38 +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#29">[ date ]</a><a href="index.html#29">[ thread ]</a><a href="subject.html#29">[ subject ]</a><a href="author.html#29">[ author ]</a>
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<li> <b>Next message:</b> <a href="0030.html">Didier Carlier: "Re: COOLSCAN II backend"</a>
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<li> <b>Previous message:</b> <a href="0028.html">Didier Carlier: "Re: COOLSCAN II backend - resend"</a>
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<li> <b>In reply to:</b> <a href="0024.html">Michael K. Johnson: "Re: COOLSCAN II backend"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0030.html">Didier Carlier: "Re: COOLSCAN II backend"</a>
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<li> <b>Reply:</b> <a href="0030.html">Didier Carlier: "Re: COOLSCAN II backend"</a>
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<!-- reply="end" -->
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</ul>
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<!-- body="start" -->
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Michael K. Johnson wrote:<br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> Didier Carlier writes:</i><br>
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<i>> >The umax backend seems ok, with little modifications, I got it to do</i><br>
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<i>> >simple things like the INQUIRE and POSITION commands on the COOLSCAN,</i><br>
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<i>> >and these seem to work. It even reads data but unfortunately the</i><br>
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<i>> >picture I get is a 28.8 Meg file all black ;-).</i><br>
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<i>> </i><br>
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<i>> Ooh, that means you really are most of the way there. I'm fairly</i><br>
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<i>> certain that the problem is that the scanner is confused by the</i><br>
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<i>> set window command -- that often causes scanners to return all</i><br>
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<i>> zeros for data. Of course, getting the rest of the way there</i><br>
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<i>> can be a long journey. I don't know what you have done so far,</i><br>
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<i>> but I'd try reducing the size of the window descriptor block,</i><br>
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<i>> probably to just the minimum defined by section 14 of the scsi</i><br>
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<i>> 2 standard. That gives less potential for conflict between</i><br>
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<i>> elements in the wdb, and a better chance of a good scan. If</i><br>
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<i>> that works, you can fill the wdb back in once you hear from Nikon</i><br>
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<i>> what their vendor-specific extensions to the wdb look like.</i><br>
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<p>
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Ohhh.. The coolscan wdb looks pretty normal. <br>
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<p>
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Didier do you have the SCSI spec? So does "section 14" mean anything<br>
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to you?<br>
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<p>
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Anyway, the Windows driver issues a "change units" command, and then<br>
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programs the window in pixels. The scan range is about an inch, so it<br>
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sets the units to 1/2800th of an inch or something close to that.<br>
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<p>
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You can also try to simply specify a window of 0, 0 to 0.5, 0.5<br>
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(600,600 in the default resolution of 1/1200th of an inch).<br>
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<p>
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Michael, your scanner just gives "black" when you give it a bad window?<br>
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The Tamarack simply locks up :-( ...<br>
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<p>
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Roger.<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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/sane/</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="0030.html">Didier Carlier: "Re: COOLSCAN II backend"</a>
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<li> <b>Previous message:</b> <a href="0028.html">Didier Carlier: "Re: COOLSCAN II backend - resend"</a>
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<li> <b>In reply to:</b> <a href="0024.html">Michael K. Johnson: "Re: COOLSCAN II backend"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0030.html">Didier Carlier: "Re: COOLSCAN II backend"</a>
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<li> <b>Reply:</b> <a href="0030.html">Didier Carlier: "Re: COOLSCAN II backend"</a>
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<!-- reply="end" -->
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</ul>
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