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<TITLE>sane-devel: xscanimage, xsane and 3-pass scanners</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (hmg-ml@gmx.de)">
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<META NAME="Subject" CONTENT="xscanimage, xsane and 3-pass scanners">
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<H1>xscanimage, xsane and 3-pass scanners</H1>
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<!-- received="Fri Mar 31 12:58:38 2000" -->
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<!-- isoreceived="20000331205838" -->
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<!-- sent="Fri, 31 Mar 2000 22:56:33 +0200" -->
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<!-- isosent="20000331205633" -->
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<!-- name="Henning Meier-Geinitz" -->
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<!-- email="hmg-ml@gmx.de" -->
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<!-- subject="xscanimage, xsane and 3-pass scanners" -->
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<!-- id="20000331225633.A25457@hmg1.vortex.swb.de" -->
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20xscanimage,%20xsane%20and%203-pass%20scanners&In-Reply-To=<20000331225633.A25457@hmg1.vortex.swb.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Mar 31 2000 - 12:56:33 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0328.html">Peter Kirchgessner: "Re: SYM22801 & HP Scanjet 5P Sane problems..."</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0326.html">Rogier Stam: "Re: SYM22801 & HP Scanjet 5P Sane problems..."</A>
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<HR NOSHADE><P>
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<!-- body="start" -->
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<P>
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Hi,
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<BR>
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<P>at the moment I am trying to look at the problems reported for Mustek 3-pass
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<BR>
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scanners in color mode. I am using a MFS-12000CX scanner and lineart/gray
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<BR>
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works fine.
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<BR>
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<P>Color mode, however, results in endless error messages after the 3rd (blue)
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<BR>
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frame is scanned (both in xscanimage and xsane). The message is something
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<BR>
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like "Error during read: scan was cancelled". This doesn't occur if
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<BR>
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non_blocking mode is disabled in the backend.
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<BR>
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<P>I think the problem is in the frontends (correct me if I am wrong). The next
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<BR>
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paragraphs are about xscanimage but I think it's the same with xsane.
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<BR>
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<P>At the start of the scan "scan_start" is called. "input_available" does the
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<BR>
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reading of data and calls "scan_start" recursively until all 3 frames are
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<BR>
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finished. At the end of "scan_start" "input_available" is called directly,
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<BR>
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if the backend doesn't support non-blocking mode. That does work. However,
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<BR>
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in the case of non-blocking mode, gdk_input_add is used to let gdk look at
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<BR>
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the sane filedescriptor. However, gdk_input_add is called once for each
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<BR>
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frame (3 times in total) and at the end of the scan only one instance is
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<BR>
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killed (in "scan_done").
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<BR>
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<P> scan_win.input_tag = -1;
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<BR>
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if (sane_set_io_mode (dev, SANE_TRUE) == SANE_STATUS_GOOD
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<BR>
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&& sane_get_select_fd (dev, &fd) == SANE_STATUS_GOOD)
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<BR>
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scan_win.input_tag = gdk_input_add (fd, GDK_INPUT_READ |
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<BR>
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GDK_INPUT_EXCEPTION, input_available, 0);
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<BR>
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else
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<BR>
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input_available (0, -1, GDK_INPUT_READ);
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<BR>
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<P>As a quick hack I did the following:
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<BR>
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<P> if (sane_set_io_mode (dev, SANE_TRUE) == SANE_STATUS_GOOD
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<BR>
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&& sane_get_select_fd (dev, &fd) == SANE_STATUS_GOOD)
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<BR>
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{
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<BR>
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if (scan_win.param.format != SANE_FRAME_GREEN
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<BR>
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&& scan_win.param.format != SANE_FRAME_BLUE)
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<BR>
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{
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<BR>
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scan_win.input_tag = gdk_input_add (fd, GDK_INPUT_READ |
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<BR>
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GDK_INPUT_EXCEPTION, input_available, 0);
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<BR>
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}
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<BR>
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}
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<BR>
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else
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<BR>
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{
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<BR>
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scan_win.input_tag = -1;
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<BR>
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input_available (0, -1, GDK_INPUT_READ);
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<BR>
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}
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<BR>
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<P>This works for me. However, it is quite ugly and I don't know if the red
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<BR>
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frame is the first in every case. So I think, it would be better to have a
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<BR>
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flag for the first frame and don't use gdk_input_add for the others.
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<BR>
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<P>Another point: Don't try to scan an image with a 3-pass scanner into a pnm
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<BR>
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file on a NFS disc. It is extremely slow (about 2k per second!), probably
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<BR>
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because of the method used to put the three frames in the pnm file (write
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<BR>
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one byte, fseek two bytes, write one byte ...).
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<BR>
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<P>One more point: The TODO file is right about the progress bar not reaching
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<BR>
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100% at the end of each frame.
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<BR>
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<P>I tried to use the 3-pass scanner with scanimage but hadn't any luck because
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<BR>
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the scan stops before the first frame gets read (sane_cancel is called). I
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<BR>
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will look into this tomorrow.
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<BR>
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<P>Bye, Henning
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<BR>
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<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:%20xscanimage,%20xsane%20and%203-pass%20scanners&In-Reply-To=<20000331225633.A25457@hmg1.vortex.swb.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0328.html">Peter Kirchgessner: "Re: SYM22801 & HP Scanjet 5P Sane problems..."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0326.html">Rogier Stam: "Re: SYM22801 & HP Scanjet 5P Sane problems..."</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 Mar 31 2000 - 12:59:52 PST</EM>
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