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<TITLE>sane-devel: Re: image defaults</TITLE>
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<META NAME="Author" CONTENT="Arnaud Calvo (arnaud@calvo-france.com)">
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<META NAME="Subject" CONTENT="Re: image defaults">
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<H1>Re: image defaults</H1>
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<STRONG>From:</STRONG> Arnaud Calvo (<A HREF="mailto:arnaud@calvo-france.com?Subject=Re:%20image%20defaults&In-Reply-To=<200009062133.e86LX3501059@Tux.Calvo>"><EM>arnaud@calvo-france.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Sep 06 2000 - 14:33:02 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0051.html">Arnaud Calvo: "driver for plustek"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0049.html">Christopher Wiggins: "Re: Scanport SQ300 with SANE / microtek2 backend"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0039.html">Stephen Williams: "Re: image defaults"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0058.html">Jaeger, Gerhard: "Re: image defaults"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0052.html">Stephen Williams: "Re: image defaults"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0058.html">Jaeger, Gerhard: "Re: image defaults"</A>
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<P>
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On 04-Sep-2000 Stephen Williams wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> That Moire is caused by the interaction of the half-tone pattern in the
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</EM><BR>
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<EM>> document and the sampling of either the scanner or the scaler. The frequency
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</EM><BR>
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<EM>> of the pattern is the difference between the frequency of the halftone
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</EM><BR>
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<EM>> on the page and the sample frequency of the scaled video.
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</EM><BR>
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[cut]
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<BR>
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<P>Without any doubt, the more complete answer !
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<BR>
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Congratulations !
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<BR>
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I appreciate very much your help (Johan Bengtsson & Peter Kirchgessner too, and
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<BR>
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others, but I don't remember the names, because I had too many answers :-)))
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<BR>
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<P>I have to admitt I didn't understand all the explaination (my english's not
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<BR>
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rich enough !). But with a combination of all the suggestions, I removed the
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<BR>
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spots :-) (high res scan + blur + scale)
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<BR>
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<P>I have another question (in fact 2) :
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<BR>
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- "The best hope, though, is to find the natural resolution of the scanner,
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<BR>
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and scan at that resolution." How can I find that ? Is there a precise way to
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<BR>
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do that ? No resolution gave me entire satisfaction... and perhaps the one that
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<BR>
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worked for this image won't work with another one...
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<BR>
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<P>- "Scan at maximum resolution, then scale down (_not_ resize..) the image in the
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<BR>
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Gimp, and then sharpen it." What's the difference beetween "scale" and "resize"
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<BR>
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? Is it a matter of "resolution" and "pixels" ? For this image, I used the
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<BR>
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option that allowed me to change the width from 900+ px to 800 px. How do you
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<BR>
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call that : resize, or scale ?
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<BR>
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<P>Thanks
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<BR>
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<P><PRE>
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--
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Arnaud Calvo <<A HREF="mailto:arnaud@calvo-france.com?Subject=Re:%20image%20defaults&In-Reply-To=<200009062133.e86LX3501059@Tux.Calvo>">arnaud@calvo-france.com</A>>
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49240 Avrill<6C>
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<P>--
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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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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0051.html">Arnaud Calvo: "driver for plustek"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0049.html">Christopher Wiggins: "Re: Scanport SQ300 with SANE / microtek2 backend"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0039.html">Stephen Williams: "Re: image defaults"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0058.html">Jaeger, Gerhard: "Re: image defaults"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0052.html">Stephen Williams: "Re: image defaults"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0058.html">Jaeger, Gerhard: "Re: image defaults"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Wed Sep 06 2000 - 14:42:02 PDT</EM>
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