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<TITLE>sane-devel: Re: [BUG] Epson 1640SU, xsane preview problem]</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@rauch-domain.de)">
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<META NAME="Subject" CONTENT="Re: [BUG] Epson 1640SU, xsane preview problem]">
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<H1>Re: [BUG] Epson 1640SU, xsane preview problem]</H1>
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<!-- received="Fri May 25 01:33:09 2001" -->
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<!-- isoreceived="20010525083309" -->
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<!-- sent="Fri, 25 May 2001 10:38:56 +0200" -->
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<!-- isosent="20010525083856" -->
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<!-- name="Oliver Rauch" -->
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<!-- email="oliver.rauch@rauch-domain.de" -->
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<!-- subject="Re: [BUG] Epson 1640SU, xsane preview problem]" -->
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<!-- id="3B0E1A20.27DA958A@rauch-domain.de" -->
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<!-- inreplyto="[BUG] Epson 1640SU, xsane preview problem]" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@rauch-domain.de?Subject=Re:%20[BUG]%20Epson%201640SU,%20xsane%20preview%20problem]&In-Reply-To=<3B0E1A20.27DA958A@rauch-domain.de>"><EM>oliver.rauch@rauch-domain.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri May 25 2001 - 01:38:56 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0338.html">Jonathan Buzzard: "Re: Problem with Microtek 35t slide/negative scanner"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0336.html">Daniel Luechtefeld: "Problem with Microtek 35t slide/negative scanner"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0339.html">Jean-Luc Coulon: "Re: [BUG] Epson 1640SU, xsane preview problem]"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0339.html">Jean-Luc Coulon: "Re: [BUG] Epson 1640SU, xsane preview problem]"</A>
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<P>
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Jean-Luc Coulon wrote:
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<BR>
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<P><EM>> > if (quality <= min_quality+20)
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> With this change, it works !
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</EM><BR>
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<P>Fine. Although this is not the correct way to solve it.
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> Now, back to the "resize" function.
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</EM><BR>
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<EM>> Basically it works : I was confused with the previous problem.
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</EM><BR>
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<EM>> But the "autoselect" button does not work as expected.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> If I place a drawind in the middle of the bed, any size selected, only
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</EM><BR>
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<EM>> the bottom line is at the right place, the other ones are at the
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</EM><BR>
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<EM>> top/left/right ends of the format.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Why is the color set to 25 instead of 55 in xsane-preview.c, line 5505 ?
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</EM><BR>
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<EM>> (this has no effect for my problem)
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</EM><BR>
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<P>Does your scanner use a black or a white background or anything else?
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<BR>
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<P>The 25 is a bug, I will replace it by 55.
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<BR>
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<P>The routine does search pixels that differ from the background. The backround
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<BR>
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has to be black or white. When one pixel is found that differs with a brightness
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<BR>
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of about 20% of the visible range the frame position is found.
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<BR>
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<P>The test is done with the gamma corrected preview, so you will get different results
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<BR>
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with different gamma/brightness/contrast settings.
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<P><P><PRE>
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--
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Homepage: <A HREF="http://www.rauch-domain.de">http://www.rauch-domain.de</A>
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sane-umax: <A HREF="http://www.rauch-domain.de/sane-umax">http://www.rauch-domain.de/sane-umax</A>
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xsane: <A HREF="http://www.xsane.org">http://www.xsane.org</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@rauch-domain.de?Subject=Re:%20[BUG]%20Epson%201640SU,%20xsane%20preview%20problem]&In-Reply-To=<3B0E1A20.27DA958A@rauch-domain.de>">Oliver.Rauch@rauch-domain.de</A>
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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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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20[BUG]%20Epson%201640SU,%20xsane%20preview%20problem]&In-Reply-To=<3B0E1A20.27DA958A@rauch-domain.de>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0338.html">Jonathan Buzzard: "Re: Problem with Microtek 35t slide/negative scanner"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0336.html">Daniel Luechtefeld: "Problem with Microtek 35t slide/negative scanner"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0339.html">Jean-Luc Coulon: "Re: [BUG] Epson 1640SU, xsane preview problem]"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0339.html">Jean-Luc Coulon: "Re: [BUG] Epson 1640SU, xsane preview problem]"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Fri May 25 2001 - 01:33:32 PDT</EM>
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