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<TITLE>sane-devel: Re: Scanner Color Shift Problem</TITLE>
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<META NAME="Author" CONTENT="Frederik Ramm (frederik@remote.org)">
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<META NAME="Subject" CONTENT="Re: Scanner Color Shift Problem">
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<H1>Re: Scanner Color Shift Problem</H1>
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<!-- received="Fri Mar 2 04:27:45 2001" -->
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<!-- sent="Fri, 2 Mar 2001 12:40:54 +0000" -->
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<!-- name="Frederik Ramm" -->
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<!-- subject="Re: Scanner Color Shift Problem" -->
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<!-- id="20010302124054.C5041@aruba.remote.org" -->
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<!-- inreplyto="3A9F0F17.6203DA58@coppice.org" -->
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<STRONG>From:</STRONG> Frederik Ramm (<A HREF="mailto:frederik@remote.org?Subject=Re:%20Scanner%20Color%20Shift%20Problem&In-Reply-To=<20010302124054.C5041@aruba.remote.org>"><EM>frederik@remote.org</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Mar 02 2001 - 04:40:54 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0031.html">Steve Underwood: "Re: Scanner Color Shift Problem"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0029.html">abel deuring: "Re: xsane - kernel 2.4.2 - sym53c860"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0026.html">Steve Underwood: "Re: Scanner Color Shift Problem"</A>
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<P>
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Hi,
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<BR>
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<P><EM>> This looks like a common colour merging problem. In most scanners there
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</EM><BR>
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<EM>> is a physical separation between the red green and blue sensors. Most
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</EM><BR>
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<EM>> scanners just feed data to the host with this separation, and the driver
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</EM><BR>
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<EM>> needs to shuffle the scan lines to accurately merge the colours. You
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</EM><BR>
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<EM>> will find code to perform this function in several sane backends. A
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</EM><BR>
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<EM>> typical offset between each sensor row is 1/75 inch, but varies between
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</EM><BR>
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<EM>> models.
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</EM><BR>
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<P>I know about that, and I've done the color merging "by the book" in my
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<BR>
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driver. Just to be on the safe side, I have changed the driver's
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<BR>
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offset by +/-1, and each time the error became even bigger. Then I
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<BR>
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tried the Windows driver that came with the product and it produced
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<BR>
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the same "error", so I have to assume it is a hardware problem.
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<BR>
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<P>Bye
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<BR>
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Frederik
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<BR>
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<P><PRE>
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--
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Frederik Ramm ## eMail <A HREF="mailto:frederik@remote.org?Subject=Re:%20Scanner%20Color%20Shift%20Problem&In-Reply-To=<20010302124054.C5041@aruba.remote.org>">frederik@remote.org</A> ## N57<35>48.10' W005<30>40.32'
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<P><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:%20Scanner%20Color%20Shift%20Problem&In-Reply-To=<20010302124054.C5041@aruba.remote.org>">majordomo@mostang.com</A>
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<LI><STRONG>Next message:</STRONG> <A HREF="0031.html">Steve Underwood: "Re: Scanner Color Shift Problem"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0029.html">abel deuring: "Re: xsane - kernel 2.4.2 - sym53c860"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0026.html">Steve Underwood: "Re: Scanner Color Shift Problem"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0031.html">Steve Underwood: "Re: Scanner Color Shift Problem"</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>Fri Mar 02 2001 - 04:28:20 PST</EM>
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