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133 wiersze
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<!-- received="Thu Dec 18 07:08:42 1997 PST" -->
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<!-- sent="Thu, 18 Dec 1997 16:08:23 +0100 (CET)" -->
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<!-- name="A. Leidenfrost" -->
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<!-- email="leidenfrost@dkrz.de" -->
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<!-- subject="Probable Bugs & Suggestions" -->
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<!-- id="" -->
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<title>sane-devel: Probable Bugs & Suggestions</title>
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<h1>Probable Bugs & Suggestions</h1>
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<b>A. Leidenfrost</b> (<a href="mailto:leidenfrost@dkrz.de"><i>leidenfrost@dkrz.de</i></a>)<br>
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<i>Thu, 18 Dec 1997 16:08:23 +0100 (CET)</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#103">[ date ]</a><a href="index.html#103">[ thread ]</a><a href="subject.html#103">[ subject ]</a><a href="author.html#103">[ author ]</a>
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<li> <b>Next message:</b> <a href="0104.html">becka@rz.uni-duesseldorf.de: "Re: Parallelle port driver ?"</a>
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<li> <b>Previous message:</b> <a href="0102.html">David Mosberger-Tang: "Re: Parallelle port driver ?"</a>
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<li> <b>Next in thread:</b> <a href="0106.html">Hallow: "Re: Probable Bugs & Suggestions"</a>
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<li> <b>Reply:</b> <a href="0106.html">Hallow: "Re: Probable Bugs & Suggestions"</a>
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<li> <b>Reply:</b> <a href="0109.html">Matto Marjanovic: "Re: Probable Bugs & Suggestions"</a>
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<li> <b>Reply:</b> <a href="0122.html">A. Leidenfrost: "Re: Probable Bugs & Suggestions"</a>
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</ul>
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-----BEGIN PGP SIGNED MESSAGE-----<br>
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<p>
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Hi everybody,<br>
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<p>
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we recently bought a scanner in my group and are delighted to be able to use<br>
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such neat stuff like SANE to access it under Linux. Thanks a lot!<br>
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<p>
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To make it even better here are some probable bugs:<br>
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<p>
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o the scan resolution is not saved correctly, i.e. when setting it to 200 dpi<br>
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it is set to 198 after a new start of xscanimage<br>
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<p>
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o setting the value for Exposure to -13 or less results in an error (besides 0<br>
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is 0 when coming from positive values and -0 when coming from negative ones)<br>
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<p>
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o trying to change any parameter during a preview or a scan results in both<br>
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xscanimage and the scanner to go nuts. There is a error popup and the<br>
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following error message is repeated eternally on the terminal where<br>
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xscanimage was started:<br>
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<p>
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Error: Failed to set value of option brightness: Device busy.<br>
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<p>
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o when using xscanimage as a gimp plugin the transfer of the image from<br>
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xscanimage to gimp sometimes doesn't seem to work. In fact, nothing seems to<br>
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happen and monitoring the process list with top reveals that xscanimage is<br>
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growing and growing and xscanimage and gimp use nearly the whole CPU. (When<br>
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xscanimage reached 23 MB I killed it, and that was for a fairly small<br>
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image of about 5 MB.)<br>
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<p>
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and suggestions:<br>
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<p>
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o what about using separate tab folders in the scan dialog for each area<br>
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surrounded by a line. This would allow for a smaller scan window plus the<br>
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user could better focus on the kind of parameters he actually wants to<br>
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manipulate. For instance you probably often only need to change resolution<br>
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and mode, so all other parametes need not to be visible.<br>
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<p>
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o Automatic Color Calibration: Ok, although I know nearly nothing about<br>
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scanning and image processing, here is my thoughts about color calibration<br>
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for a certain printer. Suppose you have an image with three linear gradient<br>
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bars for the three primary colors red, green and blue from full color to<br>
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black. Print this image on the desired printer. Take the printout and scan<br>
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it in 'Calibration Mode'. Calibration Mode compares the reference with the<br>
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scanned gradient bar separately for each color and computes three gamma<br>
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corretion curves one for each primary color. The set of gamma curves can<br>
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then be saved under the name of the printer.<br>
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What do you think about this? Would it work? What about an<br>
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additional greyscale bar for brightness correction? Would it be hard to<br>
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implement?<br>
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I got this thought because the colors of our scans are pretty wrong and we<br>
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really have problems correction them by hand.<br>
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<p>
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Finally, the environment:<br>
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<p>
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o Pentium 133Mhz, 64 MB Ram running Debian-1.3.1r6<br>
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o Microtek ScanMaker E6<br>
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o GTK 0.99.0<br>
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o SANE 0.68<br>
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o Microtek-0.4<br>
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o Gimp 0.99.16<br>
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<p>
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Thanks a lot for your time.<br>
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<p>
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Regards,<br>
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<p>
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Andree<br>
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<p>
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- ---<br>
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Andree Leidenfrost, GEOPHYSICIST<br>
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<p>
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Institute of Geophysics, Hamburg University<br>
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Bundesstrasse 55, 20146 Hamburg, Germany<br>
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phone +49 40 4123 2984, fax +49 40 4123 5441<br>
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<a href="http://www.app-geoph.dkrz.de/andree">http://www.app-geoph.dkrz.de/andree</a><br>
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<p>
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finger <a href="mailto:u250011@gp12.dkrz.de">u250011@gp12.dkrz.de</a> for PGP public key<br>
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PGP fingerprint = 5F FC 44 FF 84 71 C4 46 72 64 9A F0 EF 99 89 7C<br>
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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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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</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="0104.html">becka@rz.uni-duesseldorf.de: "Re: Parallelle port driver ?"</a>
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<li> <b>Previous message:</b> <a href="0102.html">David Mosberger-Tang: "Re: Parallelle port driver ?"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0106.html">Hallow: "Re: Probable Bugs & Suggestions"</a>
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<li> <b>Reply:</b> <a href="0106.html">Hallow: "Re: Probable Bugs & Suggestions"</a>
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<li> <b>Reply:</b> <a href="0109.html">Matto Marjanovic: "Re: Probable Bugs & Suggestions"</a>
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<li> <b>Reply:</b> <a href="0122.html">A. Leidenfrost: "Re: Probable Bugs & Suggestions"</a>
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<!-- reply="end" -->
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</ul>
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