sane-project-website/old-archive/1999-07/0102.html

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<title>sane-devel: Re: Xsane questions and wish list</title>
<h1>Re: Xsane questions and wish list</h1>
<b>Peter Kirchgessner</b> (<a href="mailto:peter@kirchgessner.net"><i>peter@kirchgessner.net</i></a>)<br>
<i>Sun, 18 Jul 1999 17:06:46 +0200</i>
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Steve Gunnell wrote:<br>
<i>&gt; </i><br>
<i>&gt; Oliver Rauch wrote:</i><br>
<i>&gt; </i><br>
<i>&gt; &gt; xsane uses the gamma bit depth the backend uses,</i><br>
<i>&gt; &gt; but the scanner gamma table has to be activated (normally</i><br>
<i>&gt; &gt; by custom gamma table in standard options, but backend dependent)!</i><br>
<i>&gt; </i><br>
<i>&gt; I'm just using the default settings. I assumed the scanner was beingchanged</i><br>
<i>&gt; because when I closed xsane and went back to xscanimage</i><br>
<i>&gt; my attempts to correct the white level in xsane were still being applied</i><br>
<i>&gt; to the xscanimage previews. I had to turn the scanner off to clear them.</i><br>
<i>&gt; </i><br>
<i>&gt; &gt; Check it in the info window (gamma correction by scanner!)</i><br>
<i>&gt; </i><br>
<i>&gt; Will do.</i><br>
<i>&gt; </i><br>
<i>&gt; &gt; Ask the backend author about the supported bit depth!</i><br>
<i>&gt; </i><br>
<i>&gt; The Photosmart FAQ indicates that at my firmware rev the scannerwill only</i><br>
<i>&gt; return 8 bit values to the host but the A/D converter handles</i><br>
<i>&gt; at least 10 bit values. Lets hear it for crippleware.</i><br>
<i>&gt; ...</i><br>
<p>
Hi Steve,<br>
<p>
the R032 firmware reports 24 and 30 bits capability of the scanner, but<br>
no tone map support which is used as a gamma map. The gamma map is<br>
simulated by software on those scanners. But only for 24 bits (as you<br>
have seen in the sane-hp manpage).<br>
You can supply me with a 30bit capable HP-scanner and I can try to add<br>
the simulation for 30 bits too if noone else will do it.<br>
<p>
<i>&gt;...</i><br>
<i>&gt; </i><br>
<i>&gt; Thanks,</i><br>
<i>&gt; </i><br>
<i>&gt; Steve Gunnell</i><br>
<i>&gt; </i><br>
<i>&gt; --</i><br>
<i>&gt; Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a></i><br>
<i>&gt; To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a></i><br>
<p>
-- Peter<br>
<p>
<pre>
-- 
Peter Kirchgessner
WWW:    <a href="http://www.kirchgessner.net">http://www.kirchgessner.net</a>
e-mail: <a href="mailto:peter@kirchgessner.net">peter@kirchgessner.net</a>
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<ul>
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<li> <b>Next message:</b> <a href="0103.html">Peter Kirchgessner: "Update hp-backend"</a>
<li> <b>Previous message:</b> <a href="0101.html">Petter Reinholdtsen: "Release early, release often"</a>
<li> <b>Maybe in reply to:</b> <a href="0077.html">Steve Gunnell: "Xsane questions and wish list"</a>
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