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<TITLE>sane-devel: Re: problems with 1.0.3 and color scanning</TITLE>
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<META NAME="Author" CONTENT="Steve Underwood (steveu@coppice.org)">
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<META NAME="Subject" CONTENT="Re: problems with 1.0.3 and color scanning">
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<H1>Re: problems with 1.0.3 and color scanning</H1>
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<!-- received="Thu Sep 21 07:29:10 2000" -->
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<!-- sent="Thu, 21 Sep 2000 22:48:15 +0800" -->
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<!-- subject="Re: problems with 1.0.3 and color scanning" -->
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<STRONG>From:</STRONG> Steve Underwood (<A HREF="mailto:steveu@coppice.org?Subject=Re:%20problems%20with%201.0.3%20and%20color%20scanning&In-Reply-To=<39CA1FAF.D5557DB4@coppice.org>"><EM>steveu@coppice.org</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Sep 21 2000 - 07:48:15 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0215.html">Lawrence Glaister: "Re: problems with 1.0.3 and color scanning"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0213.html">Oliver Rauch: "Re: scanimage always connects to /dev/video"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0202.html">Lawrence Glaister: "problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0215.html">Lawrence Glaister: "Re: problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0215.html">Lawrence Glaister: "Re: problems with 1.0.3 and color scanning"</A>
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<P>
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Lawrence Glaister wrote:
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<BR>
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<P><EM>> I am trying to get sane 1.0.3 working with my snapscan 1212u usb scanner.
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</EM><BR>
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<EM>> The scanner works properly under 1.0.1 but fails in various ways under 1.0.2
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</EM><BR>
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<EM>> and 1.0.3 and the cvs code as of sept 19. I have narrowed the problem down
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</EM><BR>
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<EM>> to the snapscan-sources.c RGBRouter_remaining() function.
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</EM><BR>
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<EM>> - grayscale scanning works fine
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</EM><BR>
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<EM>> - color scanning a small image at 50dpi works
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</EM><BR>
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<EM>> - color scanning same image at 75dpi breaks xscanimage
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</EM><BR>
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<EM>> by broken, I mean that xscanimage enters into an infinite loop using 100%
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</EM><BR>
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<EM>> cpu time.
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</EM><BR>
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<EM>> the cause for this appears to be a negative result returned by
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</EM><BR>
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<EM>> RGBRouter_remaining(). There are two possible return values calulated in
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</EM><BR>
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<EM>> RGBRouter_remaining() and one of them always looks like the correct
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</EM><BR>
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<EM>> answer... the problem comes in that the conditional used doesn't seem to
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</EM><BR>
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<EM>> work in all cases (sometimes the wrong value is returned and when this
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</EM><BR>
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<EM>> is -ve, all hell breaks loose.). I have been getting a headache trying to
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</EM><BR>
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<EM>> decipher how the new RGBRouter code is supposed to work... could the author
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</EM><BR>
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<EM>> (pere) or someone have a look at the function and see if they see any
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</EM><BR>
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<EM>> obvious errors. I have not seen a lot of postings about 1.0.3, so the
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</EM><BR>
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<EM>> problem may be related only to the snapscan backend with a usb patch applied
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</EM><BR>
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<EM>> to it.
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</EM><BR>
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<EM>> I can supply some rather detailed dumps of the good scans and bad scans as I
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</EM><BR>
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<EM>> have added a lot of dbg calls into the snapscan code.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Are there any snapscan scanners usb or scsi out there working with sane
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</EM><BR>
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<EM>> 1.0.3???
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</EM><BR>
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<P>Excellent. This look likes a really solid lead for what goes wrong. I will try
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<BR>
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to look at the RGBRouter code in the next couple of days, and see if I can spot
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<BR>
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what goes amiss. Actually, I thought the current RGBRouter code was fairly
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<BR>
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straightforward, but maybe that's only to my own twisted mind! The existing
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<BR>
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code certainly does work for some scanners. It works just fine for my Acer
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<BR>
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610+, and a few other people have reported success with some scanners.
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<BR>
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<P>Lets hope this is the root cause of several not quite identical problems people
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<BR>
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have reported.
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<BR>
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<P>If you have any debug logs, or other useful info please mail it to me. my code
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<BR>
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hasn't given me any trouble so far, so a log of an actual failure would be
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<BR>
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helpful.
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<BR>
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<P>Steve
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<BR>
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<P><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=<39CA1FAF.D5557DB4@coppice.org>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0215.html">Lawrence Glaister: "Re: problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0213.html">Oliver Rauch: "Re: scanimage always connects to /dev/video"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0202.html">Lawrence Glaister: "problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0215.html">Lawrence Glaister: "Re: problems with 1.0.3 and color scanning"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0215.html">Lawrence Glaister: "Re: problems with 1.0.3 and color scanning"</A>
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: <EM>Thu Sep 21 2000 - 07:29:37 PDT</EM>
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