sane-project-website/old-archive/1997-02/0145.html

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<!-- name="Matthias Lautner" -->
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<!-- subject="Re: sane-0.57 available" -->
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<title>sane-devel: Re: sane-0.57 available</title>
<h1>Re: sane-0.57 available</h1>
<b>Matthias Lautner</b> (<a href="mailto:lautner@hoggle.syscomp.de"><i>lautner@hoggle.syscomp.de</i></a>)<br>
<i>Wed, 14 May 1997 10:54:55 +0200 (MET DST)</i>
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Hi!<br>
<p>
I tested sane-0.57 on my MFS-12000CX 3-pass scanner and got errors while<br>
scanning color images with gamma table allthough the scanned image looks good.<br>
<p>
// after 1st pass, while the lamp moves back<br>
Error: Failed to set value of option red-gamma-table: Device busy.<br>
Error: Failed to set value of option green-gamma-table: Device busy.<br>
Error: Failed to set value of option blue-gamma-table: Device busy.<br>
// after 2nd pass, while the lamp moves back<br>
Error: Failed to set value of option gamma-table: Device busy.<br>
Error: Failed to set value of option red-gamma-table: Device busy.<br>
Error: Failed to set value of option green-gamma-table: Device busy.<br>
Error: Failed to set value of option blue-gamma-table: Device busy.<br>
<p>
The progress bar of xscanimage stops at each scan after about 90% and proceeds<br>
to 100% on the next pass<br>
<p>
Halftone scanning with xscanimage:<br>
pattern size 0 works good. In all other cases the Pattern box has only a<br>
horizontal Line. How can I set the patterns. xscanimage offers only a<br>
curve to alter like gamma correction.<br>
<p>
The brightness and contrast is calculated wrong for 3-pass mustek scanners.<br>
change in function encode_percentage() in mustek.c<br>
code = (int) ((value / 100.0 / quant) + 0.5) + 0x0c;<br>
to<br>
code = (int) (((value +100) / 100.0 * 12.0) + 0.5);<br>
// quant is now unused<br>
<p>
In color scanning the previous settings of brightness and contrast from a former<br>
Lineart scan are used and take effect. Why shouldn<64>t it be allowed to set<br>
brightness and contrast in color mode?<br>
<p>
greetings<br>
<p>
Matthias<br>
------------------------------------------------------------------<br>
Matthias Lautner                       email: <a href="mailto:m_lautner@syscomp.de">m_lautner@syscomp.de</a><br>
Fa. SYSCOMP GmbH Augsburg, Germany     phone: 0821 / 4201-139<br>
Biochemische Dienstleistungen          fax  : 0821 / 4201-411<br>
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<ul>
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<li> <b>Next message:</b> <a href="0146.html">Reimond Rombey: "Scanner and Printer - Copier"</a>
<li> <b>Previous message:</b> <a href="0144.html">David Mosberger-Tang: "Re: no mustek device - MFS6000SP"</a>
<li> <b>In reply to:</b> <a href="0134.html">David Mosberger-Tang: "sane-0.57 available"</a>
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