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<TITLE>sane-devel: problems with 1.0.3 and color scanning</TITLE>
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<META NAME="Author" CONTENT="Lawrence Glaister (lg@jfm.bc.ca)">
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<META NAME="Subject" CONTENT="problems with 1.0.3 and color scanning">
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<H1>problems with 1.0.3 and color scanning</H1>
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<!-- received="Wed Sep 20 22:38:02 2000" -->
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<!-- sent="Wed, 20 Sep 2000 22:43:19 -0700" -->
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<!-- name="Lawrence Glaister" -->
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<!-- email="lg@jfm.bc.ca" -->
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<!-- subject="problems with 1.0.3 and color scanning" -->
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<STRONG>From:</STRONG> Lawrence Glaister (<A HREF="mailto:lg@jfm.bc.ca?Subject=Re:%20problems%20with%201.0.3%20and%20color%20scanning&In-Reply-To=<002801c0238e$d90fe680$bf0aa8c0@dufusiii>"><EM>lg@jfm.bc.ca</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Sep 20 2000 - 22:43:19 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0203.html">Paul Aschenborn: "Re: Problems with Mustek 1200 SP, mode color. WITH debug.log"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0201.html">kwlee: "A backend develope problem"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0214.html">Steve Underwood: "Re: problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0214.html">Steve Underwood: "Re: problems with 1.0.3 and color scanning"</A>
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<HR NOSHADE><P>
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<P>
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I am trying to get sane 1.0.3 working with my snapscan 1212u usb scanner.
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<BR>
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The scanner works properly under 1.0.1 but fails in various ways under 1.0.2
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<BR>
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and 1.0.3 and the cvs code as of sept 19. I have narrowed the problem down
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<BR>
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to the snapscan-sources.c RGBRouter_remaining() function.
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<BR>
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- grayscale scanning works fine
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<BR>
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- color scanning a small image at 50dpi works
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<BR>
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- color scanning same image at 75dpi breaks xscanimage
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<BR>
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by broken, I mean that xscanimage enters into an infinite loop using 100%
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<BR>
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cpu time.
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<BR>
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the cause for this appears to be a negative result returned by
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<BR>
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RGBRouter_remaining(). There are two possible return values calulated in
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<BR>
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RGBRouter_remaining() and one of them always looks like the correct
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<BR>
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answer... the problem comes in that the conditional used doesn't seem to
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<BR>
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work in all cases (sometimes the wrong value is returned and when this
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<BR>
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is -ve, all hell breaks loose.). I have been getting a headache trying to
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<BR>
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decipher how the new RGBRouter code is supposed to work... could the author
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<BR>
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(pere) or someone have a look at the function and see if they see any
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<BR>
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obvious errors. I have not seen a lot of postings about 1.0.3, so the
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<BR>
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problem may be related only to the snapscan backend with a usb patch applied
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<BR>
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to it.
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<BR>
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I can supply some rather detailed dumps of the good scans and bad scans as I
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<BR>
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have added a lot of dbg calls into the snapscan code.
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<BR>
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<P>Are there any snapscan scanners usb or scsi out there working with sane
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<BR>
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1.0.3???
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<BR>
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<P>=======================================================
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<BR>
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Lawrence Glaister VE7IT email: <A HREF="mailto:lg@jfm.bc.ca?Subject=Re:%20problems%20with%201.0.3%20and%20color%20scanning&In-Reply-To=<002801c0238e$d90fe680$bf0aa8c0@dufusiii>">lg@jfm.bc.ca</A>
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<BR>
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1462 Madrona Drive <A HREF="http://jfm.bc.ca">http://jfm.bc.ca</A>
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<BR>
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Nanoose Bay BC Canada
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<BR>
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V9P 9C9
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<BR>
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=======================================================
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<BR>
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<P><P><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?Subject=Re:%20problems%20with%201.0.3%20and%20color%20scanning&In-Reply-To=<002801c0238e$d90fe680$bf0aa8c0@dufusiii>">majordomo@mostang.com</A>
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</PRE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0203.html">Paul Aschenborn: "Re: Problems with Mustek 1200 SP, mode color. WITH debug.log"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0201.html">kwlee: "A backend develope problem"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0214.html">Steve Underwood: "Re: problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0214.html">Steve Underwood: "Re: problems with 1.0.3 and color scanning"</A>
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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 20 2000 - 22:40:02 PDT</EM>
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