sane-project-website/old-archive/1999-08/0256.html

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<title>sane-devel: Re: SANE frames</title>
<h1>Re: SANE frames</h1>
<b>Oliver Rauch</b> (<a href="mailto:oliver.rauch@Wolfsburg.DE"><i>oliver.rauch@Wolfsburg.DE</i></a>)<br>
<i>Sat, 21 Aug 1999 14:35:00 +0200</i>
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David Mosberger-Tang wrote:<br>
<p>
<i>&gt; &gt;&gt;&gt;&gt;&gt; On Fri, 20 Aug 1999 15:48:49 +0200, Oliver Rauch &lt;<a href="mailto:oliver.rauch@Wolfsburg.DE">oliver.rauch@Wolfsburg.DE</a>&gt; said:</i><br>
<i>&gt;</i><br>
<i>&gt;   Oliver&gt; Another thing is that some scanners are able to do a "batch</i><br>
<i>&gt;   Oliver&gt; scan", that means the scanner does scan multiple images</i><br>
<i>&gt;   Oliver&gt; while the scanhead moves over the page, so the scanhead is</i><br>
<i>&gt;   Oliver&gt; not moved into start position every time.  But this can not</i><br>
<i>&gt;   Oliver&gt; be used with the current sane standard.</i><br>
<i>&gt;</i><br>
<i>&gt; I disagree.  sane_start() is a signal that the frontend is ready to</i><br>
<i>&gt; read the next image.  It does _not_ necessarily mean that the scanhead</i><br>
<i>&gt; should go back to its start position.</i><br>
<i>&gt;</i><br>
<p>
Hi David,<br>
<p>
I do not know how other scanners do batch scanning.<br>
The umax scanners that support the batch scan mode need<br>
the geometry for the current scan and the starting position for<br>
the next scan when sane_start is called. But a frontend is not able<br>
to set the geometry values for the next scanarea in the moment.<br>
<p>
This could be done by a well known option that a backend makes<br>
available when it supports the batch scanning mode, but:<br>
to keep it compatible for all scanners we better could add a<br>
possibilty to define multiple scanareas before the first<br>
sane_start is called if we want to support the batch scan modes<br>
of the scanners.<br>
<p>
I don`t know if that is necessary but I think it is worth a discussion.<br>
<p>
Bye<br>
Oliver<br>
<p>
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EMAIL: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>
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<li> <b>Next message:</b> <a href="0257.html">Andreas Beck: "Re: Acer Scanners"</a>
<li> <b>Previous message:</b> <a href="0255.html">Oliver Rauch: "Re: Starting a discussion about SANE and TWAIN..."</a>
<li> <b>Maybe in reply to:</b> <a href="0173.html">Stephen Williams: "SANE frames"</a>
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<li> <b>Next in thread:</b> <a href="0262.html">Oliver Rauch: "Re: SANE frames"</a>
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