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<title>sane-devel: Re: B&amp;W qcam with SANE 0.6</title>
<h1>Re: B&amp;W qcam with SANE 0.6</h1>
<b>David Mosberger-Tang</b> (<a href="mailto:davidm@azstarnet.com"><i>davidm@azstarnet.com</i></a>)<br>
<i>Tue, 17 Jun 1997 15:04:35 -0700</i>
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<i>&gt;&gt;&gt;&gt;&gt; On Tue, 17 Jun 1997 17:49:03 -0400 (EDT), Andrew Kuchling &lt;<a href="mailto:amk@magnet.com">amk@magnet.com</a>&gt; said:</i><br>
<p>
<i> &gt;&gt; No, unfortunately. Nobody with a b&amp;w camera has come forward to</i><br>
<i> &gt;&gt; debug the remaining issues so far.</i><br>
<p>
Andrew&gt; I'm willing to work on that, if you'll let me know what the<br>
Andrew&gt; remaining issues are.<br>
<p>
If I knew what the problem was, I'd have fixed it! ;-)<br>
<p>
Seriously: I think all the necessary b&amp;w code is there, but there are<br>
obviously some bugs in it. It may be a good idea to take a look at a<br>
driver that is known to work with the b&amp;w camera and see what the SANE<br>
backend is doing wrong. A list of QCam drivers can be found at:<br>
<p>
<a href="http://www.unm.dorm.net/quickcam/">http://www.unm.dorm.net/quickcam/</a><br>
<p>
Andres&gt; This B&amp;W QuickCam has been<br>
Andrew&gt; temporarily borrowed from a friend, so it's possible I<br>
Andrew&gt; haven't set it up properly. My goal is to get it working,<br>
Andrew&gt; and then write a SANE interface for the Python Imaging<br>
Andrew&gt; Library (<a href="http://www.python.org/sigs/image-sig/Imaging.html">http://www.python.org/sigs/image-sig/Imaging.html</a>)<br>
Andrew&gt; so you can initiate a scan and get an Image object, which<br>
Andrew&gt; can then be fiddled with.<br>
<p>
Sounds like a fun project!<br>
<p>
Andrew&gt; With the ||1 (added in two places), scanimage runs and<br>
Andrew&gt; completes uneventfully, but the resulting PNM file isn't<br>
Andrew&gt; what the camera is pointing at. --test-image=yes produces<br>
Andrew&gt; the same result, so the problem is something fairly<br>
Andrew&gt; fundamental.<br>
<p>
It sounds like the bits aren't read off the wire properly. May be a<br>
stupid bug or it may be due to problems with the parallel port (I<br>
run my quickcam in standard, bi-direction mode, so that part is fairly<br>
well tested; I'm less sure about the uni-directional code).<br>
<p>
Andrew&gt; Should it be reading from the device even with<br>
Andrew&gt; --test-image=yes?<br>
<p>
Yes. The idea of --test-image is to test everything except the actual<br>
CCD. That makes it much easier to diagnose problems with the hw<br>
setup.<br>
<p>
--david<br>
<p>
<pre>
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