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80 wiersze
3.8 KiB
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<!-- received="Wed Jul 28 05:46:40 1999 PDT" -->
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<!-- sent="Wed, 28 Jul 1999 14:58:32 +0200" -->
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<!-- name="Andreas Rick" -->
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<!-- email="rickand@gemse.fr" -->
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<!-- subject="Re: LS30 prescan" -->
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<!-- id="379EFE78.9A5E5276@gemse.fr" -->
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<!-- inreplyto="LS30 prescan" -->
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<title>sane-devel: Re: LS30 prescan</title>
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<h1>Re: LS30 prescan</h1>
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<b>Andreas Rick</b> (<a href="mailto:rickand@gemse.fr"><i>rickand@gemse.fr</i></a>)<br>
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<i>Wed, 28 Jul 1999 14:58:32 +0200</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#202">[ date ]</a><a href="index.html#202">[ thread ]</a><a href="subject.html#202">[ subject ]</a><a href="author.html#202">[ author ]</a>
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<li> <b>Next message:</b> <a href="0203.html">Rob Fisher: "SANE and Solaris 7"</a>
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<li> <b>Previous message:</b> <a href="0201.html">Nicolas.DE-PESLOUAN@generale-des-eaux.net: "Re: Document Feeders"</a>
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<li> <b>Maybe in reply to:</b> <a href="0199.html">Ewald R. de Wit: "LS30 prescan"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0208.html">Ewald R. de Wit: "SANE & exposure times"</a>
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<li> <b>Reply:</b> <a href="0208.html">Ewald R. de Wit: "SANE & exposure times"</a>
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</ul>
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<!-- body="start" -->
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"Ewald R. de Wit" wrote:<br>
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<i>> </i><br>
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<i>> Andreas Rick (<a href="mailto:rickand@gemse.fr">rickand@gemse.fr</a>) wrote:</i><br>
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<i>> </i><br>
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<i>> > When you put the film strip into the scanner</i><br>
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<i>> > (Strip of up to 6 24*36mm slides/negatives )</i><br>
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<i>> > the scanner does a very quick scan of the whole strip</i><br>
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<i>> > to find out and store the positions of all images.</i><br>
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<i>> </i><br>
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<i>> Are you positive about this? I thought the prescan was to</i><br>
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<i>> establish the density of the images on the filmstrip and</i><br>
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<i>> to use the optimal exposure time for each colorchannel</i><br>
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<i>> (to fill the full bit range). It can do the positioning</i><br>
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<i>> without prescan too so that's why I was wondering.</i><br>
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<p>
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When I said "quick scan" I didn't mean the "prescan".<br>
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The "quick scan" happens when you put in the film without<br>
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sending anything to the scanner on the SCSI bus.<br>
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I called it "quick scan" as it determines already something<br>
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based on the images on the film - I'm not sure whether the<br>
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scanner is actually scanning.<br>
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As you said: "Prescan" - which you have to ask for by a SCSI command once<br>
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you have positioned the film on one image - is to find the exposure time.<br>
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<p>
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<i>> Btw, is there anyway a frontend could extract the proper</i><br>
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<i>> RGB exposure times from you backend?</i><br>
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<p>
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Not in version 0.4.2 but I am working on the problem.<br>
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Do you really need these values or would it be sufficient<br>
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if you can change the exposure time in percent of the optimal<br>
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value determined by the prescan as it was for the LS-20?<br>
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I ask because my current developement version pre0.4.3 can <br>
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only change the exposure values relative and I was wondering<br>
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if I need to do more.<br>
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<p>
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-<br>
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Andreas<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="0203.html">Rob Fisher: "SANE and Solaris 7"</a>
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<li> <b>Previous message:</b> <a href="0201.html">Nicolas.DE-PESLOUAN@generale-des-eaux.net: "Re: Document Feeders"</a>
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<li> <b>Maybe in reply to:</b> <a href="0199.html">Ewald R. de Wit: "LS30 prescan"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0208.html">Ewald R. de Wit: "SANE & exposure times"</a>
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<li> <b>Reply:</b> <a href="0208.html">Ewald R. de Wit: "SANE & exposure times"</a>
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<!-- reply="end" -->
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</ul>
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