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98 wiersze
4.7 KiB
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<!-- received="Tue Sep 2 09:22:46 1997 MST" -->
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<!-- sent="Tue, 2 Sep 1997 17:32:25 +0200" -->
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<!-- name="Wolfgang Jung" -->
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<!-- email="woju@keep.in-berlin.de" -->
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<!-- subject="Re: Backtracking in color scanning" -->
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<!-- id="9709021448.AA22170@gypsy.atlantic.infi.net" -->
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<!-- inreplyto="9709021448.AA22170@gypsy.atlantic.infi.net" -->
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<title>sane-devel: Re: Backtracking in color scanning</title>
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<h1>Re: Backtracking in color scanning</h1>
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<b>Wolfgang Jung</b> (<a href="mailto:woju@keep.in-berlin.de"><i>woju@keep.in-berlin.de</i></a>)<br>
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<i>Tue, 2 Sep 1997 17:32:25 +0200</i>
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<p>
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<li> <b>Next message:</b> <a href="0125.html">Henning Sauer: "UMAX Scanner ?"</a>
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<li> <b>Previous message:</b> <a href="0123.html">shendrix@gypsy.atlantic.infi.net: "Re: Backtracking in color scanning"</a>
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<li> <b>In reply to:</b> <a href="0125.html">Henning Sauer: "UMAX Scanner ?"</a>
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<li> <b>Next in thread:</b> <a href="0126.html">Michael K. Johnson: "Re: UMAX Scanner ?"</a>
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--1jdw2sOBCFtR2d/S<br>
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Content-Type: text/plain; charset=us-ascii<br>
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<p>
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On Tue, Sep 02, 1997 at 10:48:00AM -0400, <a href="mailto:shendrix@gypsy.atlantic.infi.net">shendrix@gypsy.atlantic.infi.net</a> wrote:<br>
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<i>> </i><br>
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<i>> In message <19970901104750.53420@drawbridge.in-berlin.de> </i><br>
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<i>> <a href="mailto:woju@keep.in-berlin.de">woju@keep.in-berlin.de</a> (> ) writes:</i><br>
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<i>> </i><br>
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<i>> > Just calcualte the Data the scanner needs to transfer.</i><br>
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<i>> > As Far as I could find the Mustek Scanner justs uses async transfer</i><br>
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<i>> > to the HOST which could be as slow as 1.5MB/S (even if you Adapter</i><br>
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<i>> > could get up to 7MB/s )</i><br>
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<i>> > An tiny Area of 1" times 1" brings you with 24 Bit and 1200 dpi Color</i><br>
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<i>> > into 4320000 Bytes of Imagedata. if the scanner is able to scan that within</i><br>
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<i>> > 1 Second the scanner needs to stop to get rid of the</i><br>
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<i>> > Data.</i><br>
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<i>> </i><br>
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<i>> Well, under Windows95 it usually never did backtracking. When it did,</i><br>
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<i>> it only backed up half the number of times it does with sane. This</i><br>
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<i>> was with the little cheap controller it came with too.</i><br>
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<p>
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I suspect the driver just got a lot more of Data in one chunk, or just<br>
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issued the READ Command almost immediatly after completition of the<br>
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previous one. If you watch the Statusbar in the Win95 tool, you might<br>
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have detected, that it just moves one or two times if you scane an area of <br>
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2x3 inches (estimate). I think they use an awful big buffer for<br>
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scanning, or at least TWAIN uses a real big one bevore sending it<br>
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to the applikation.<br>
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<p>
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<i>> </i><br>
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<i>> There had got to be a way to get it as fast as under Windows. My scanner</i><br>
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<i>> is backtracking every half inch sometimes. Under Win95 it always moved at</i><br>
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<i>> least a couple of inches before backtracking.</i><br>
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<p>
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I would love top get the gray mode working :-(.<br>
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But I think the Idea with using a MEG of SG Buffer is no good Idea.<br>
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I probably will experimet a bit on the comingf weekend. building a small<br>
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testprogramm which tries to get the READ Command issued as soon<br>
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as possible. <br>
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<p>
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Gruss<br>
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Wolfgang<br>
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<p>
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--1jdw2sOBCFtR2d/S<br>
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<p>
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--1jdw2sOBCFtR2d/S--<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="0125.html">Henning Sauer: "UMAX Scanner ?"</a>
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<li> <b>Previous message:</b> <a href="0123.html">shendrix@gypsy.atlantic.infi.net: "Re: Backtracking in color scanning"</a>
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<li> <b>In reply to:</b> <a href="0125.html">Henning Sauer: "UMAX Scanner ?"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0126.html">Michael K. Johnson: "Re: UMAX Scanner ?"</a>
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<!-- reply="end" -->
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</ul>
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