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73 wiersze
3.2 KiB
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<!-- received="Mon Mar 15 16:29:41 1999 PST" -->
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<!-- sent="Tue, 16 Mar 1999 00:30:06 +0000 (GMT)" -->
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<!-- name="Nick Lamb" -->
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<!-- email="njl98r@ecs.soton.ac.uk" -->
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<!-- subject="Re: HP ScanJet IIc ADF report" -->
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<!-- inreplyto="36ED5DF3.F67D834C@kirchgessner.net" -->
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<title>sane-devel: Re: HP ScanJet IIc ADF report</title>
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<h1>Re: HP ScanJet IIc ADF report</h1>
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<b>Nick Lamb</b> (<a href="mailto:njl98r@ecs.soton.ac.uk"><i>njl98r@ecs.soton.ac.uk</i></a>)<br>
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<i>Tue, 16 Mar 1999 00:30:06 +0000 (GMT)</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#154">[ date ]</a><a href="index.html#154">[ thread ]</a><a href="subject.html#154">[ subject ]</a><a href="author.html#154">[ author ]</a>
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<li> <b>Next message:</b> <a href="0155.html">Bernd Schroeder: "Re: microtek2 driver"</a>
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<li> <b>Previous message:</b> <a href="0153.html">john allen pitney: "Re: HP Photosmart R032"</a>
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</ul>
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On Mon, 15 Mar 1999, Peter Kirchgessner wrote:<br>
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<p>
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<i>> the HP ScanJet IIc has an optical resolution of 400 dpi. All other values</i><br>
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<i>> are interpolated. The scanner can do an interpolation for 12 to 1600</i><br>
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<i>> dpi.</i><br>
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<p>
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This doesn't match up very well with my actual experience of using the<br>
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scanner. I suppose it's possible (but unlikely) that it is broken...<br>
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<p>
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Here are some example results (happily scanned with the new XSane release)<br>
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they are all for _exactly the same physical scan area_<br>
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<p>
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400 dpi color scan --> 364 x 374 image<br>
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600 dpi color scan --> 546 x 560 image<br>
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800 dpi color scan --> 728 x 747 image<br>
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900 dpi color scan --> 720 x 740 image (!)<br>
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1600 dpi color scan --> 728 x 747 image (!)<br>
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<p>
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I don't particularly care whether the scanner has an optical resolution of<br>
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400 dpi, 800 dpi or even 1600 dpi for that matter. But I do know that the<br>
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SANE backend never gives me more 728 x 747 (which is 800 dpi exactly)<br>
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no matter how high a resolution I choose from scanimage or XSane.<br>
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<p>
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I've just tested in Windows, and there I can do a 1600dpi scan but as you<br>
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say, this is interpolated data, and by 1600dpi it's becoming rather too<br>
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obvious that most of the data is a fairy tale (15 made up pixels for each<br>
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one read by hardware I guess).<br>
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<p>
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So, I suppose I'd like (1) An HP backend fix if applicable, and (2) Some<br>
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future SANE standard to include Optical Resolution where known, so that I<br>
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don't waste my SCSI bandwidth on interpolated data :)<br>
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<p>
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If this problem can't be diagnosed remotely, I'll look at it on Sunday.<br>
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<p>
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Nick.<br>
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<p>
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<p>
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<pre>
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--
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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="0155.html">Bernd Schroeder: "Re: microtek2 driver"</a>
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<li> <b>Previous message:</b> <a href="0153.html">john allen pitney: "Re: HP Photosmart R032"</a>
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<!-- nextthread="start" -->
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</ul>
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