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79 wiersze
3.4 KiB
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<!-- received="Fri Apr 23 19:12:30 1999 PDT" -->
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<!-- sent="Fri, 23 Apr 1999 20:09:03 +0200 (MEST)" -->
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<!-- name="becka@rz.uni-duesseldorf.de" -->
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<!-- subject="Re: Scanning and interpolation" -->
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<!-- id="m10akNr-000CEgC@hades.beck-sw.de" -->
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<!-- inreplyto="Pine.OSF.4.05.9904230958330.17031-100000@waage" -->
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<title>sane-devel: Re: Scanning and interpolation</title>
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<h1>Re: Scanning and interpolation</h1>
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<a href="mailto:becka@rz.uni-duesseldorf.de"><i>becka@rz.uni-duesseldorf.de</i></a><br>
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<i>Fri, 23 Apr 1999 20:09:03 +0200 (MEST)</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#334">[ date ]</a><a href="index.html#334">[ thread ]</a><a href="subject.html#334">[ subject ]</a><a href="author.html#334">[ author ]</a>
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<li> <b>Next message:</b> <a href="0335.html">John Profic: "ScanImg.exe from WinSANE0.9 fails under WinNT and Win98"</a>
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<li> <b>Previous message:</b> <a href="0333.html">becka@rz.uni-duesseldorf.de: "Re: SANE on MacOS, MacOS X ?"</a>
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<li> <b>Next in thread:</b> <a href="0346.html">becka@rz.uni-duesseldorf.de: "Re: Scanning and interpolation"</a>
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<li> <b>Reply:</b> <a href="0346.html">becka@rz.uni-duesseldorf.de: "Re: Scanning and interpolation"</a>
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</ul>
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Hi !<br>
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<p>
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<i>> The best result is obtained by scanning in 1200 dpi and reducing the </i><br>
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<i>> file with jpg compression, even though I had expected scanning in 300</i><br>
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<i>> dpi to as good as 1200 dpi.</i><br>
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<p>
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<i>> SANE does no interpolation and will only deliver the optical resolution </i><br>
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<i>> of the scanner. Is the apparent enhancement of the picture only an</i><br>
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<i>> illusion?</i><br>
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<p>
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Yes. Interpolation does not add any "inormation". It just places a grey pixel<br>
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between a black and a white one.<br>
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<p>
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<i>> It might be a good idea to introduce interpolation into SANE ? </i><br>
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<p>
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No. It just adds useless data that carries no information to the output.<br>
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<p>
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<i>> Is the algorithms behind this free ? </i><br>
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<p>
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I hope so. If someone patented this : <br>
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<p>
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interpolated_pixel(between_pixel_1_and_pixel_2)=<br>
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( pixel_1*distance_to_1+<br>
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pixel_2*distance_to_2) /<br>
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( distance_to_1+distance_to_2 )<br>
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<p>
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he is definitely insane.<br>
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<p>
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<i>> How is the interpolation done ? Close to the hardware or on the picture</i><br>
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<i>> after scanning ? E.g. could it be done in GIMP ? -</i><br>
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<p>
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Yes - choose "resample".<br>
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<p>
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CU, ANdy<br>
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<p>
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<pre>
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--
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= Andreas Beck | Email : <<a href="mailto:andreas.beck@ggi-project.org">andreas.beck@ggi-project.org</a>> =
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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="0335.html">John Profic: "ScanImg.exe from WinSANE0.9 fails under WinNT and Win98"</a>
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<li> <b>Previous message:</b> <a href="0333.html">becka@rz.uni-duesseldorf.de: "Re: SANE on MacOS, MacOS X ?"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0346.html">becka@rz.uni-duesseldorf.de: "Re: Scanning and interpolation"</a>
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<li> <b>Reply:</b> <a href="0346.html">becka@rz.uni-duesseldorf.de: "Re: Scanning and interpolation"</a>
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</ul>
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