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<TITLE>sane-devel: Re: snapscan 1212u_2 problems</TITLE>
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<META NAME="Author" CONTENT="Lawrence Glaister (lg@jfm.bc.ca)">
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<META NAME="Subject" CONTENT="Re: snapscan 1212u_2 problems">
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<H1>Re: snapscan 1212u_2 problems</H1>
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<!-- received="Tue Dec 26 17:26:48 2000" -->
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<!-- sent="Tue, 26 Dec 2000 17:39:23 -0800" -->
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<!-- name="Lawrence Glaister" -->
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<!-- subject="Re: snapscan 1212u_2 problems" -->
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<!-- inreplyto="200012262252.TAA10504@linux2.uccor.edu.ar" -->
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<STRONG>From:</STRONG> Lawrence Glaister (<A HREF="mailto:lg@jfm.bc.ca?Subject=Re:%20snapscan%201212u_2%20problems&In-Reply-To=<00d001c06fa5$d70cc840$bf0aa8c0@dufusiii>"><EM>lg@jfm.bc.ca</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Dec 26 2000 - 17:39:23 PST
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<LI><STRONG>Previous message:</STRONG> <A HREF="0273.html">Mark Stewart: "Umax 600s/Adaptec 2906 trouble"</A>
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the color image may be a little smaller by up to several lines. The reason
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<BR>
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for this is that the sensor is reading the color information from slightly
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<BR>
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offset positions on the page and the scanner software (snapscan driver)
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<BR>
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attempts to reregister the lines of data. In other words, the line of red
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<BR>
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scan data may need to be combined with the green data from 3 scan lines
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<BR>
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later in the data flow. Because of this, the scanner may scan 500 * 3 lines
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<BR>
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but only 497 triplets of aligned data may come out of the driver.... some
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gets discarded because it doesn't have all 3 color bands available. Even at
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<BR>
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high scan resolutions, it looks like there should be 6 or less lines
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<BR>
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discarded. I did put a print statement in my driver to see what the offsets
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were and they mostly showed up as 2 or 3 lines depending on resolution. I
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<BR>
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have never had scan data messed up like the picture you sent me... I suspect
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<BR>
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there have been some changes which broke the 1212u driver more than it
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<BR>
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already was. If I get a chance in the next few days, I will download the
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<BR>
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latest snapscan driver and sane 1.0.4 and see if I can get it running again.
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<BR>
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Its probably worth having our discussions on the sane maillist so that more
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<BR>
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people are aware of the problem.
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<BR>
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=======================================================
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<BR>
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Lawrence Glaister VE7IT email: <A HREF="mailto:lg@jfm.bc.ca?Subject=Re:%20snapscan%201212u_2%20problems&In-Reply-To=<00d001c06fa5$d70cc840$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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----- Original Message -----
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<BR>
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From: John Coppens <<A HREF="mailto:jcoppens@linux2.uccor.edu.ar?Subject=Re:%20snapscan%201212u_2%20problems&In-Reply-To=<00d001c06fa5$d70cc840$bf0aa8c0@dufusiii>">jcoppens@linux2.uccor.edu.ar</A>>
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<BR>
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To: Lawrence Glaister <<A HREF="mailto:lg@jfm.bc.ca?Subject=Re:%20snapscan%201212u_2%20problems&In-Reply-To=<00d001c06fa5$d70cc840$bf0aa8c0@dufusiii>">lg@jfm.bc.ca</A>>
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<BR>
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Sent: Tuesday, December 26, 2000 2:53 PM
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<BR>
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Subject: Re: A few questions
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<BR>
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<P><P><EM>> On Mon, 25 Dec 2000 20:16:08 -0800 "Lawrence Glaister" <<A HREF="mailto:lg@jfm.bc.ca?Subject=Re:%20snapscan%201212u_2%20problems&In-Reply-To=<00d001c06fa5$d70cc840$bf0aa8c0@dufusiii>">lg@jfm.bc.ca</A>>
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</EM><BR>
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wrote/El dddd> Hi John,
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<BR>
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<EM>> > ok, great, we are using the same scanner. I have the "upload required"
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</EM><BR>
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<EM>> > version as well. I plugged it into my ups and only have to reload every
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</EM><BR>
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few
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<BR>
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<EM>> > months when we get a really nasty power day. I posted some fixes to the
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</EM><BR>
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<EM>> > 1.0.3 snapscan version that were hacks, but got me going. I had two
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</EM><BR>
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<EM>> > problems, one, the scanner software would hang in an infinite loop
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</EM><BR>
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during
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<BR>
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<EM>> > scsi speed calibration and another where the usb status returned EAGAIN.
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</EM><BR>
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I'm
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<BR>
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<EM>> >...
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Hi Lawrence
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> After some difficult experimenting (because of 36C temperatures) I did
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</EM><BR>
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<EM>> find something strange.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I scanned an image at 50bpi, same format, in gray, b/w, and color. I then
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</EM><BR>
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<EM>> checked the size of the image received from the scanner, summing the WROTE
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</EM><BR>
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<EM>> statements of the debug output. I get correct numbers for b/w, and
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</EM><BR>
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grayscale,
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<BR>
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<EM>> but the color image is off:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Summing WROTEs: 724599 bytes
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</EM><BR>
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<EM>> The image should be: 723330 bytes (570 x 1269bytes/line,
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</EM><BR>
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<EM>> as reported in the same debug output)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> That's one line difference (1269 bytes).
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Now, if I only could determine where this difference comes from... Any
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</EM><BR>
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<EM>> suggestions?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> John
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>>
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</EM><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:%20snapscan%201212u_2%20problems&In-Reply-To=<00d001c06fa5$d70cc840$bf0aa8c0@dufusiii>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0275.html">Eugene Kanter: "xsane-0.68 configure problem fixed?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0273.html">Mark Stewart: "Umax 600s/Adaptec 2906 trouble"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Tue Dec 26 2000 - 17:32:51 PST</EM>
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