sane-project-website/old-archive/1999-04/0144.html

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<!-- subject="Scanner -&gt; printer problem" -->
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<title>sane-devel: Scanner -&gt; printer problem</title>
<h1>Scanner -&gt; printer problem</h1>
<b>Raymond A. Ingles</b> (<a href="mailto:inglesra@frc.com"><i>inglesra@frc.com</i></a>)<br>
<i>Thu, 8 Apr 1999 09:17:14 -0400 (EDT)</i>
<p>
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<li> <b>Next message:</b> <a href="0145.html">Andreas Dilger: "Re: Scanner -&gt; printer problem"</a>
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 I've been trying for a while to get my scanner and printer to cooperate<br>
and act like a copy machine. I've got a small script that I've hacked in<br>
various ways, but no matter what I try, I can't get the scale quite right.<br>
<p>
 I've got a Mustek scanner that I use with SANE (at 300dpi, lineart mode)<br>
and an HP DeskJet 600 printer (used at 300dpi again). SANE spits out a<br>
PPM-format file.<br>
<p>
 I've tried using "pnmtops" (from the netpbm package) and "convert" (from<br>
ImageMagick) to produce a postscript file that then goes through<br>
magicfilter. I *thought* I read the man pages appropriately, but the image<br>
on the paper is not *quite* the same size as the original.<br>
<p>
 I used a ruler and made centimeter marks on a page, horizontally and<br>
vertically. When I scan things in, though, I get an image where the<br>
vertical axis is "squashed" a bit. Instead of 100%x100%, it's more like<br>
100%x91%.<br>
<p>
 But that's not the most annoying. Even if I compensate for this, I just<br>
can *not* get my printer to produce output that matches the input. No<br>
matter what I do, the "centimeters" on the printed page are either smaller<br>
or larger than the original. Once, I managed to get the horizontal<br>
centimeters to match up, but then the vertical axis was squashed.<br>
<p>
 Anyway here's the 'xerox' script I've tried:<br>
<p>
-----------------------------------------------<br>
#!/bin/sh<br>
# Device to scan from<br>
DEV=mustek:/dev/scanner<br>
# 300 dpi<br>
RES=300<br>
# Next 4 measurement are in millimeters<br>
LEFT=5<br>
TOP=5<br>
WIDTH=205<br>
HEIGHT=255<br>
# From the pnmtops man page<br>
SCALE=.25<br>
# The actual command: scan -&gt; pnmtops -&gt; lpr<br>
scanimage -d ${DEV} -l ${LEFT} -t ${TOP} -x ${WIDTH} -y ${HEIGHT} \<br>
        --resolution --mode Lineart ${RES} | \<br>
        pnmtops -dpi 300 -center -rle -scale ${SCALE} | \<br>
        lpr<br>
-----------------------------------------------<br>
<p>
 I have also tried things like:<br>
<p>
convert -geometry 100%x100%\! -density 300x300 -page 2400x3300+0+0 \<br>
/tmp/xerox.ppm /tmp/xerox.ps<br>
lpr /tmp/xerox.ps<br>
<p>
 Does anyone have any suggestions or ideas on what I might try? I know<br>
that I'm not going to get a perfect copy, but the divergence I'm seeing is<br>
really annoying. There are some plans and things I'd like to "xerox" where<br>
scaling is disastrous. And dang it, it should be possible to get darn<br>
close with this equipment.<br>
<p>
 Sincerely,<br>
<p>
 Ray Ingles       (248) 377-7735      <a href="mailto:ray.ingles@fanucrobotics.com">ray.ingles@fanucrobotics.com</a><br>
<p>
 If all the muscles in your body pulled in the same direction, you<br>
 could lift over twenty tons. But you'd walk funny. - L. M. Boyd<br>
<p>
<p>
<pre>
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</pre>
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<p>
<ul>
<!-- next="start" -->
<li> <b>Next message:</b> <a href="0145.html">Andreas Dilger: "Re: Scanner -&gt; printer problem"</a>
<li> <b>Previous message:</b> <a href="0143.html">Petter Reinholdtsen: "Re: Linking non-libtool libraries into a new backend?"</a>
<li> <b>In reply to:</b> <a href="0143.html">Petter Reinholdtsen: "Re: Linking non-libtool libraries into a new backend?"</a>
<!-- nextthread="start" -->
<li> <b>Next in thread:</b> <a href="0146.html">Oliver Rauch: "Re: Scanner -&gt; printer problem"</a>
<li> <b>Reply:</b> <a href="0146.html">Oliver Rauch: "Re: Scanner -&gt; printer problem"</a>
<li> <b>Reply:</b> <a href="0163.html">Dr. Andreas Bolsch: "Re: Scanner -&gt; printer problem"</a>
<!-- reply="end" -->
</ul>