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113 wiersze
5.4 KiB
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<!-- received="Wed Jun 23 12:53:43 1999 PDT" -->
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<!-- sent="Wed, 23 Jun 1999 21:54:16 +0200" -->
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<!-- name="Oliver Rauch" -->
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<!-- email="oliver.rauch@Wolfsburg.DE" -->
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<!-- subject="Re: Fix for grayscale scans with gamma < 1.0" -->
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<!-- inreplyto="Fix for grayscale scans with gamma < 1.0" -->
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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>Oliver Rauch</b> (<a href="mailto:oliver.rauch@Wolfsburg.DE"><i>oliver.rauch@Wolfsburg.DE</i></a>)<br>
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<i>Wed, 23 Jun 1999 21:54:16 +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#163">[ date ]</a><a href="index.html#163">[ thread ]</a><a href="subject.html#163">[ subject ]</a><a href="author.html#163">[ author ]</a>
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<li> <b>Next message:</b> <a href="0164.html">Nick Lamb: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<li> <b>Previous message:</b> <a href="0162.html">Oliver Rauch: "Re: Newbie question ;-)"</a>
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<li> <b>Maybe in reply to:</b> <a href="0154.html">David Fox: "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="0167.html">David Fox: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<li> <b>Reply:</b> <a href="0167.html">David Fox: "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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David Fox wrote:<br>
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<p>
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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>> > 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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<i>></i><br>
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<i>> No problem... I'm currently scanning some very old and deteriorating</i><br>
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<i>> black and white photographs, and I've noticed a couple of problems</i><br>
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<i>> with using xsane. First, the range of the xsane brightness and</i><br>
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<i>> contrast controls is much less than the range provided in scanimage,</i><br>
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<i>> at least with my HP-3c scanner using the HP back-end.</i><br>
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<i>></i><br>
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<i>> Second, I think I will also need to be able to change the brightness</i><br>
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<i>> and contrast settings used when acquiring the preview, and see new</i><br>
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<i>> histograms and perform the usual xsane modifications in relation to</i><br>
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<i>> those new ``default'' settings.</i><br>
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<p>
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The birghtness and contrast of xsane is a software created digital gamma<br>
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table and has nothing to do with the options the scanner makes available,<br>
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these are still available in xsane under standard or advanced options!<br>
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<p>
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You can change the scanner brightness and contrast and do a new preview<br>
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scan and see the changes in the histogram.<br>
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I think about adding support for a preview scan with more than 8/24 bits/pixel,<br>
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but I am not sure if that really is necessary.<br>
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<p>
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<i>></i><br>
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<i>></i><br>
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<i>> If we could make these changes (and I do plan to work on this) and add</i><br>
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<i>> a few tweaks like changing the cursor when the rubber band is</i><br>
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<i>> grabbable I think xsane could be a superior scanning client to any</i><br>
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<i>> I've used in the Windows world. (IMHO.)</i><br>
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<i>></i><br>
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<p>
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This is planned, but in the moment I spent my time for the umax backend<br>
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because UMAX gave me to scanners to test/make supported by the<br>
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backend.<br>
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<p>
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May be next month I find the time to work again on xsane!<br>
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<p>
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Bye<br>
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Oliver<br>
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<p>
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<p>
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<pre>
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--
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EMAIL: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>
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WWW: <a href="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</a>
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<p>
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<p>
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<p>
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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="0164.html">Nick Lamb: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<li> <b>Previous message:</b> <a href="0162.html">Oliver Rauch: "Re: Newbie question ;-)"</a>
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<li> <b>Maybe in reply to:</b> <a href="0154.html">David Fox: "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="0167.html">David Fox: "Re: Fix for grayscale scans with gamma < 1.0"</a>
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<li> <b>Reply:</b> <a href="0167.html">David Fox: "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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