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73 wiersze
3.6 KiB
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<!-- received="Tue May 26 23:00:22 1998 PDT" -->
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<!-- sent="Wed, 27 May 1998 07:59:50 +0200 (MET DST)" -->
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<!-- name="Rogier Wolff" -->
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<!-- email="R.E.Wolff@BitWizard.nl" -->
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<!-- subject="Re: new UMAX-Patch available" -->
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<!-- id="199805270559.HAA00723@cave.BitWizard.nl" -->
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<!-- inreplyto="199805261540.LAA10268@earth.astro.umd.edu" -->
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<title>sane-devel: Re: new UMAX-Patch available</title>
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<h1>Re: new UMAX-Patch available</h1>
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<b>Rogier Wolff</b> (<a href="mailto:R.E.Wolff@BitWizard.nl"><i>R.E.Wolff@BitWizard.nl</i></a>)<br>
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<i>Wed, 27 May 1998 07:59:50 +0200 (MET DST)</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#281">[ date ]</a><a href="index.html#281">[ thread ]</a><a href="subject.html#281">[ subject ]</a><a href="author.html#281">[ author ]</a>
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<li> <b>Next message:</b> <a href="0282.html">Andreas Tille: "Re: [long] Overall usage impressions"</a>
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<li> <b>Previous message:</b> <a href="0280.html">Matto Marjanovic: "Re: Agfa Arcus"</a>
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<li> <b>In reply to:</b> <a href="0269.html">William L. Sebok: "Re: new UMAX-Patch available"</a>
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</ul>
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William L. Sebok wrote:<br>
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<i>> </i><br>
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<i>> <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a> says:</i><br>
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<i>> </i><br>
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<i>> > It looks like a white calibration table for each pixel of the ccd that</i><br>
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<i>> > is used for the requested scan. So - I think - if a CCD-pixel has an other</i><br>
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<i>> > output level than the other CCD-pixels, it can be corrected that way.</i><br>
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<i>> > May be it is possible to do a kind of highlight-function by that.</i><br>
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<p>
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<i>> This sort of correction has to be done very carefully when one uses</i><br>
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<i>> a ccd camera for Astronomical purposes. It's called a "flat-field"</i><br>
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<i>> calibration and was often done by taking pictures of the inside of</i><br>
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<i>> the closed telescope dome. In fact sometimes it was hard to see</i><br>
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<i>> things until this correction was done. I'm not surprised that a way</i><br>
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<i>> of doing this has been provided in a scanner that uses a ccd</i><br>
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<i>> detector.</i><br>
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<p>
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My scanner, the Tamarack 12000C, does this on its own whenever you tell<br>
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it to start scanning. Pain in the A**: It does this EVERY time you tell<br>
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it to scan, not just the first time during every session.<br>
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<p>
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The astronomer types also trust the CCD to remain for the twenty<br>
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minutes that they use to take a picture so why can't my desktop<br>
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scanner?<br>
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<p>
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Roger. <br>
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<p>
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<p>
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<pre>
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--
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If it's there and you can see it, it's REAL <a href="mailto:|___R.E.Wolff@BitWizard.nl">|___R.E.Wolff@BitWizard.nl</a> |
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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.mostang.com/sane/">http://www.mostang.com/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="0282.html">Andreas Tille: "Re: [long] Overall usage impressions"</a>
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<li> <b>Previous message:</b> <a href="0280.html">Matto Marjanovic: "Re: Agfa Arcus"</a>
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<li> <b>In reply to:</b> <a href="0269.html">William L. Sebok: "Re: new UMAX-Patch available"</a>
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<!-- nextthread="start" -->
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</ul>
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