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<!-- received="Fri Jul 18 09:08:04 1997 MST" -->
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<!-- sent="Fri, 18 Jul 1997 08:47:46 -0700" -->
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<!-- name="David Mosberger-Tang" -->
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<!-- email="davidm@azstarnet.com" -->
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<!-- subject="Re: Mustek 3-pass scanner test code" -->
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<!-- id="199707181547.IAA26600@panda.mosberger" -->
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<!-- inreplyto="davidm@AZStarNet.COM" -->
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<title>sane-devel: Re: Mustek 3-pass scanner test code</title>
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<h1>Re: Mustek 3-pass scanner test code</h1>
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<b>David Mosberger-Tang</b> (<a href="mailto:davidm@azstarnet.com"><i>davidm@azstarnet.com</i></a>)<br>
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<i>Fri, 18 Jul 1997 08:47:46 -0700</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#85">[ date ]</a><a href="index.html#85">[ thread ]</a><a href="subject.html#85">[ subject ]</a><a href="author.html#85">[ author ]</a>
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<li> <b>Next message:</b> <a href="0086.html">Jeremy Hansen: "Re: Mustek 3-pass scanner test code"</a>
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<li> <b>Previous message:</b> <a href="0084.html">David Mosberger-Tang: "mustek 3-pass fix"</a>
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</ul>
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<i>>>>>> On Fri, 18 Jul 1997 16:56:53 -0600, "Mathias Weigt (Stud. 94)" <<a href="mailto:p5iba@medchem2.pharmazie.uni-halle.de">p5iba@medchem2.pharmazie.uni-halle.de</a>> said:</i><br>
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<p>
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David> Could somebody with Linux and a Mustek 3-pass scanner try the<br>
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David> code below and tell me how/if it works?<br>
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<p>
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Mathias> I tested it very shortly and I believe that scanning has<br>
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Mathias> become faster :-) -- but it seems to be memory dependend<br>
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Mathias> :-( I have only 40MB)... scanimage --mode color<br>
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Mathias> --resolution 300 dpi >/dev/null needs 3:45 min.<br>
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<p>
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Wow, it used to take 15 minutes, right? That would be a nice<br>
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improvement. How does it compare to the scan times with other<br>
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programs?<br>
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<p>
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Mathias> The system crashes sometimes (so on a 600 dpi scan in the<br>
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Mathias> middle of the third pass) but this may be kernel instabilities ?<br>
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<p>
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I certainly haven't seen any crashes due to SANE. Do you mean the<br>
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_entire_ system crashes or just some tasks get killed? The latter<br>
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happens under Linux when running out of swap space.<br>
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<p>
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Mathias> The first pass is done really fast, the second and third pass<br>
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Mathias> becomes slower. It seems to depend on how fast the system<br>
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Mathias> is able to swap, because during one pass the scanner<br>
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Mathias> sometimes gets fast for some seconds and becomes slow<br>
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Mathias> again. I assume that a 128 MB System won`t have<br>
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Mathias> performance problems unless it is driving StarOffice :-).<br>
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<p>
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This makes sense with the current buffering scheme: the first pass<br>
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simply writes out data. The second and third passes in contrast have<br>
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to read the existing data, add info for one channel, then write it<br>
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back out. There was some discussion to implement a better buffering<br>
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scheme that would fix such problems for scanimage, but AFAIK, nobody<br>
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has done it so far. If you scan with xscanimage instead of scanimage,<br>
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the swap problem _ought_ to go away. I'd be interested to hear how<br>
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well it works under GIMP as well.<br>
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<p>
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Mathias> Sorry but I can`t provide debug output or look deeper into<br>
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Mathias> it because I`m going on holiday tomorrow... Nice to see<br>
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Mathias> 3-pass patches :-)...<br>
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<p>
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Well, enjoy your vacation then! Thanks for testing things!<br>
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<p>
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--david<br>
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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="0086.html">Jeremy Hansen: "Re: Mustek 3-pass scanner test code"</a>
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<li> <b>Previous message:</b> <a href="0084.html">David Mosberger-Tang: "mustek 3-pass fix"</a>
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</ul>
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