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<!-- received="Thu May 15 07:55:14 1997 MST" -->
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<!-- sent="Thu, 15 May 1997 07:25:35 -0700" -->
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<!-- name="David Mosberger-Tang" -->
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<!-- email="davidm@azstarnet.com" -->
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<!-- subject="Re: [patch] Re: sane-0.57 available" -->
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<!-- id="199705151425.HAA20538@panda.mosberger" -->
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<!-- inreplyto="199705150739.JAA30562@hoggle.syscomp.de" -->
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<title>sane-devel: Re: [patch] Re: sane-0.57 available</title>
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<h1>Re: [patch] Re: sane-0.57 available</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>Thu, 15 May 1997 07:25:35 -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#3">[ date ]</a><a href="index.html#3">[ thread ]</a><a href="subject.html#3">[ subject ]</a><a href="author.html#3">[ author ]</a>
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<li> <b>Next message:</b> <a href="0004.html">David Mosberger-Tang: "Re: ScanJet 4p and sane"</a>
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<li> <b>Previous message:</b> <a href="0002.html">Matthias Lautner: "Re: [patch] Re: sane-0.57 available"</a>
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<li> <b>In reply to:</b> <a href="0002.html">Matthias Lautner: "Re: [patch] Re: sane-0.57 available"</a>
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<i>>>>>> On Thu, 15 May 1997 09:39:24 +0200 (MET DST), Matthias Lautner <l=</i><br>
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<a href="mailto:autner@hoggle.syscomp.de">autner@hoggle.syscomp.de</a>> said:<br>
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<p>
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Matthias> Hi! First some technical data about my scanner: The<br>
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Matthias> scanner is labeled MFS-12000CX [mustek] attach: firmware<br>
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Matthias> revision 2.71 [mustek] attach: found Mustek scanner model<br>
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Matthias> MFS-12000CX (flatbed scanner), 3-pass<br>
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<p>
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Thanks for the info!<br>
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<p>
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Matthias> I implemented the patch for contrast & brightness Now the<br>
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Matthias> maximum range in the brightness controll of xscanimage is<br>
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Matthias> -36% .. 36% and -84% .. 84% for contrast. Is this right?<br>
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<p>
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Yup, according to the manual, that's correct.<br>
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<p>
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Matthias> The brightness and contrast is still calculated wrong for<br>
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Matthias> 3-pass mustek scanners. The result ranges from 1 to 24,<br>
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Matthias> it should be 0 to 24. change in function<br>
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Matthias> encode_percentage() in mustek.c code =3D (int) ((value /<br>
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Matthias> quant) + 0.5) + 0x0c; to code =3D (int) ((value / quant) +<br>
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Matthias> 12.5);<br>
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<p>
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Ah, right, the negative values get truncated in the "wrong" direction.<br>
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I changed my source to your (working) version.<br>
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<p>
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Matthias> The errors: "Failed to set value of option<br>
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Matthias> red-gamma-table: Device busy." between the passes of a<br>
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Matthias> 3-pass scan originates in a call to gsg_sync(dialog) in<br>
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Matthias> the function scan_start(void) in xscanimage.c. It seems,<br>
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Matthias> that a redraw of the gamma tables send the gamma values to<br>
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Matthias> the scanner (which doesn=B4t want to be disturbed while<br>
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Matthias> working.)<br>
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<p>
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Ouch. I'll look into this.<br>
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<p>
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Matthias> I enabled brightness and contrast in color mode. It works<br>
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Matthias> pretty!<br>
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<p>
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Great! I changed the sources so the brightness/contrast controls are<br>
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enabled for 3-pass scanners.<br>
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<p>
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Matthias> The progress bar stops at each scan after about 90% and<br>
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Matthias> proceeds to 100% on the next pass of a 3 pass scan. The<br>
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Matthias> value of the bar is calculated right, but it is not<br>
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Matthias> updated on the screen.<br>
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<p>
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Hmmh, could you try putting:<br>
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<p>
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if (ScanWin.input_tag < 0)<br>
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=09while (gdk_events_pending ())<br>
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=09 gtk_main_iteration ();<br>
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<p>
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right below:<br>
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<p>
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=09 if (status =3D=3D SANE_STATUS_EOF)<br>
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=09 {<br>
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<p>
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in xscanimage.c and see whether that helps (just search for<br>
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SANE_STATUS_EOF---there is only one in the entire file).<br>
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<p>
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Matthias> My scanner manual says that there are 12 internal patterns<br>
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Matthias> for halftone scanning. How can they be activated.<br>
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<p>
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The docs I have make no mention of builtin halftone patterns, so I<br>
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don't know how to select them (does any other Mustek scanner program<br>
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support this? if so, maybe you could find out from there).<br>
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<p>
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Matthias> Does<br>
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Matthias> anybody knows something about the format of customized<br>
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Matthias> half-tone patterns?<br>
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<p>
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I don't.<br>
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<p>
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=09--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="0004.html">David Mosberger-Tang: "Re: ScanJet 4p and sane"</a>
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<li> <b>Previous message:</b> <a href="0002.html">Matthias Lautner: "Re: [patch] Re: sane-0.57 available"</a>
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<li> <b>In reply to:</b> <a href="0002.html">Matthias Lautner: "Re: [patch] Re: sane-0.57 available"</a>
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<!-- nextthread="start" -->
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</ul>
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