sane-project-website/old-archive/1998-04/0085.html

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<!-- name="Henning Meier-Geinitz" -->
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<title>sane-devel: sane-0.72 and mustek 600 II N</title>
<h1>sane-0.72 and mustek 600 II N</h1>
<b>Henning Meier-Geinitz</b> (<a href="mailto:hmg-ml@gmx.de"><i>hmg-ml@gmx.de</i></a>)<br>
<i>Thu, 9 Apr 1998 01:56:51 +0200</i>
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Hi!<br>
<p>
I tried sane-0.72 with the following system:<br>
<p>
Linux 2.0.33 (Pentium166), gtk+ 0.99.8, gimp 0.99.22, mustek 600 II N<br>
parallel port scanner.<br>
<p>
Some comments:<br>
<p>
1)<br>
Sane compiles without errors. As reported some time ago, the scanner<br>
only works (most of the time) if  SANE_DEBUG_SANEI_AB306 is set to 4<br>
or higher. I couldn't locate exactly this problem.<br>
<p>
2)<br>
Lineart, halftone and greyscale work. Color doesn't, there are<br>
horizontal stripes and wrong colors. I did some changes in mustek.c<br>
and that works for me. But it's more a hack. Please try the enclosed<br>
patch because I don't know if this works with all mustek 600 II N<br>
scanners. line-distance-fix must be *disabled*, my scanner sends the<br>
correct line-distance values. The data color sequence is RGB. In the<br>
scanner the first lcd line is red, second blue, third green.  <br>
<p>
I got errors with resolutions &gt; 300 dpi in color mode:<br>
"Xlib: unexpected async reply (sequence 0xe5c)!". These can be<br>
ommitted by changing the standard buffer size from 32k to something<br>
higher, for example in mustek.c, reader_process (hack!):<br>
<p>
  lines_per_buffer = sanei_scsi_max_request_size / bpl;<br>
    <br>
--&gt;   lines_per_buffer = 128 * 1024 / bpl;<br>
<p>
3)<br>
After using xscanimage the light istn't shut off.<br>
<p>
4)<br>
If the scan process is stopped manually, mustek.c waits 60 s<br>
(timeout) everytime before resetting the scanner. Bug or feature?<br>
<p>
5)<br>
If I want to leave xscanimage, X seems to hang f<>r about 5 seconds. No<br>
key or mouse click is accepted anywhere.<br>
<p>
6)<br>
If the scanning process is aborted by killing xscanimage, the scanner<br>
won't react any more. A newly started xscanimage waits forever. I have<br>
to turn off and on the scanner manually.<br>
<p>
7)<br>
mustek.c doesn't ignore empty lines in mustek.conf. It tries to open<br>
"" as a device for every empty line.<br>
<p>
8)<br>
My scanner is much faster in color mode than in grey mode. It seems to<br>
backtrack in grey mode but not in color mode.<br>
<p>
Keep on the good work!<br>
<p>
Ciao, Henning<br>
<p>
And now the patch for color-support:<br>
<p>
diff -ruN sane-0.72.orig/backend/mustek.c sane-0.72/backend/mustek.c<br>
--- sane-0.72.orig/backend/mustek.c	Tue Mar  3 04:02:43 1998<br>
+++ sane-0.72/backend/mustek.c	Thu Apr  9 01:10:58 1998<br>
@@ -1394,7 +1394,7 @@<br>
 	}<br>
     }<br>
 <br>
-  num_saved_lines = s-&gt;ld.index[0] - s-&gt;ld.index[2];<br>
+  num_saved_lines = s-&gt;ld.index[0] - s-&gt;ld.index[1];<br>
   if (num_saved_lines &gt; 0)<br>
     /* restore the previously saved lines: */<br>
     memcpy (out, s-&gt;ld.buf[0], num_saved_lines * bpl);<br>
@@ -1404,7 +1404,7 @@<br>
       if (++s-&gt;ld.lmod3 &gt;= 3)<br>
 	s-&gt;ld.lmod3 = 0;<br>
 <br>
-      c = color_seq[s-&gt;ld.lmod3];<br>
+      c = s-&gt;ld.lmod3;<br>
       if (s-&gt;ld.index[c] &lt; 0)<br>
 	++s-&gt;ld.index[c];<br>
       else if (s-&gt;ld.index[c] &lt; s-&gt;params.lines)<br>
@@ -1421,17 +1421,17 @@<br>
 		  DBG (1, "fix_line_distance_pp: lmod3=%d, index=(%d,%d,%d)\n",<br>
 		       s-&gt;ld.lmod3,<br>
 		       s-&gt;ld.index[0], s-&gt;ld.index[1], s-&gt;ld.index[2]);<br>
-		  num_lines = s-&gt;ld.index[2] - s-&gt;ld.ld_line;<br>
+		  num_lines = s-&gt;ld.index[1] - s-&gt;ld.ld_line;<br>
 <br>
 		  /* copy away the lines with at least one missing<br>
 		     color component, so that we can interleave them<br>
 		     with new scan data on the next call */<br>
-		  num_saved_lines = s-&gt;ld.index[0] - s-&gt;ld.index[2];<br>
+		  num_saved_lines = s-&gt;ld.index[0] - s-&gt;ld.index[1];<br>
 		  memcpy (s-&gt;ld.buf[0], out + num_lines * bpl,<br>
 			  num_saved_lines * bpl);<br>
 <br>
 		  /* notice the number of lines we processed */<br>
-		  s-&gt;ld.ld_line = s-&gt;ld.index[2];<br>
+		  s-&gt;ld.ld_line = s-&gt;ld.index[1];<br>
 		  /* return number of complete (r+g+b) lines */<br>
 		  return num_lines;<br>
 		}<br>
<p>
<p>
<pre>
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