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<!-- received="Wed Jun 23 11:42:13 1999 PDT" -->
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<!-- sent="23 Jun 1999 11:43:05 -0700" -->
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<!-- name="David Fox" -->
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<!-- email="dsfox@cogsci.ucsd.edu" -->
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<!-- subject="Re: Fix for grayscale scans with gamma < 1.0" -->
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<!-- inreplyto="Wed, 23 Jun 1999 19:55:46 +0200"" -->
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<title>sane-devel: Re: Fix for grayscale scans with gamma < 1.0</title>
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<h1>Re: Fix for grayscale scans with gamma < 1.0</h1>
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<b>David Fox</b> (<a href="mailto:dsfox@cogsci.ucsd.edu"><i>dsfox@cogsci.ucsd.edu</i></a>)<br>
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<i>23 Jun 1999 11:43:05 -0700</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#159">[ date ]</a><a href="index.html#159">[ thread ]</a><a href="subject.html#159">[ subject ]</a><a href="author.html#159">[ author ]</a>
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<li> <b>Next message:</b> <a href="0160.html">Gunnar Schroeder: "Newbie question ;-)"</a>
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<li> <b>Previous message:</b> <a href="0158.html">Oliver Rauch: "New umax backend (build 6)"</a>
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<li> <b>In reply to:</b> <a href="0155.html">Oliver Rauch: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0163.html">Oliver Rauch: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<!-- reply="end" -->
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</ul>
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<!-- body="start" -->
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Oliver Rauch <<a href="mailto:oliver.rauch@Wolfsburg.DE">oliver.rauch@Wolfsburg.DE</a>> writes:<br>
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<p>
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<i>> David Fox wrote:</i><br>
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<i>> </i><br>
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<i>> > Oliver Rauch <<a href="mailto:oliver.rauch@Wolfsburg.DE">oliver.rauch@Wolfsburg.DE</a>> writes:</i><br>
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<i>> ></i><br>
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<i>> > > I uploaded xsane-0.26 to my homepage:</i><br>
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<i>> > > <a href="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</a></i><br>
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<i>> ></i><br>
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<i>> > Oliver,</i><br>
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<i>> ></i><br>
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<i>> > I've found a bug whose most obvious symptom is that grayscale scans</i><br>
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<i>> > with a gamma < 1.0 come out pure black.</i><br>
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<i>> </i><br>
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<i>> Hi David,</i><br>
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<i>> </i><br>
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<i>> thanks for that info,</i><br>
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<i>> </i><br>
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<i>> I thought I corrected all this</i><br>
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<i>> (but looks I only tested the color routines).</i><br>
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<i>> </i><br>
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<i>> This will be ok in xsane-0.27!</i><br>
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<p>
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No problem... I'm currently scanning some very old and deteriorating<br>
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black and white photographs, and I've noticed a couple of problems<br>
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with using xsane. First, the range of the xsane brightness and<br>
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contrast controls is much less than the range provided in scanimage,<br>
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at least with my HP-3c scanner using the HP back-end.<br>
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<p>
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Second, I think I will also need to be able to change the brightness<br>
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and contrast settings used when acquiring the preview, and see new<br>
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histograms and perform the usual xsane modifications in relation to<br>
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those new ``default'' settings.<br>
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<p>
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If we could make these changes (and I do plan to work on this) and add<br>
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a few tweaks like changing the cursor when the rubber band is<br>
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grabbable I think xsane could be a superior scanning client to any<br>
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I've used in the Windows world. (IMHO.)<br>
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<pre>
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--
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David Fox <a href="http://hci.ucsd.edu/dsf">http://hci.ucsd.edu/dsf</a> xoF divaD
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UCSD HCI Lab baL ICH DSCU
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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="0160.html">Gunnar Schroeder: "Newbie question ;-)"</a>
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<li> <b>Previous message:</b> <a href="0158.html">Oliver Rauch: "New umax backend (build 6)"</a>
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<li> <b>In reply to:</b> <a href="0155.html">Oliver Rauch: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0163.html">Oliver Rauch: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<!-- reply="end" -->
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</ul>
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