sane-project-website/old-archive/1998-06/0031.html

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<title>sane-devel: Re: new UMAX-Patch available</title>
<h1>Re: new UMAX-Patch available</h1>
<b>Matto Marjanovic</b> (<a href="mailto:maddog@mir.com"><i>maddog@mir.com</i></a>)<br>
<i>Thu, 4 Jun 1998 14:07:50 -0400 (EDT)</i>
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Date: Wed, 27 May 1998 07:59:50 +0200 (MET DST)<br>
From: <a href="mailto:R.E.Wolff@BitWizard.nl">R.E.Wolff@BitWizard.nl</a> (Rogier Wolff)<br>
<p>
William L. Sebok wrote:<br>
<i> &gt; </i><br>
<i> &gt; <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a> says:</i><br>
<i> &gt; </i><br>
<i> &gt; &gt; It looks like a white calibration table for each pixel of the ccd that</i><br>
<i> &gt; &gt; is used for the requested scan. So - I think - if a CCD-pixel has an other</i><br>
...<br>
<i> &gt; This sort of correction has to be done very carefully when one uses</i><br>
<i> &gt; a ccd camera for Astronomical purposes. It's called a "flat-field"</i><br>
<i> &gt; calibration and was often done by taking pictures of the inside of</i><br>
...<br>
<p>
My scanner, the Tamarack 12000C, does this on its own whenever you tell<br>
it to start scanning. Pain in the A**: It does this EVERY time you tell<br>
it to scan, not just the first time during every session.<br>
<p>
<p>
Is there any subtle command to tell it to not calibrate?<br>
The Microtek(1) scanners have a bit you can set to force them to not<br>
calibrate at the start of a scan. Of course, in Microtek-style, if <br>
the scanner is not calibrated once to start with, it silently resets<br>
itself and hangs the scsi bus....<br>
<p>
-matt m.<br>
<p>
<p>
<p>
<pre>
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