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<title>sane-devel: Re: Document Feeders (was Re: Anyone with a Umax Document Feeder?)</title>
<h1>Re: Document Feeders (was Re: Anyone with a Umax Document Feeder?)</h1>
<b>Nick Lamb</b> (<a href="mailto:njl98r@ecs.soton.ac.uk"><i>njl98r@ecs.soton.ac.uk</i></a>)<br>
<i>Tue, 27 Jul 1999 18:42:04 +0100 (GMT)</i>
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On Tue, 27 Jul 1999, Oliver Rauch wrote:<br>
<p>
<i>&gt; Where is the problem when the backend calls "change page"</i><br>
<i>&gt; before starting the scan when scan source is set to "ADF" ?</i><br>
<i>&gt; This does work for all scanners with ADF!</i><br>
<i>&gt; I see no problem with this, because the idea of the ADF is to put in</i><br>
<i>&gt; a lot of papers that shall be copied, faxed or archieved, so the user</i><br>
<i>&gt; selects starts and comes back half an hour later and everything is</i><br>
<i>&gt; finished.</i><br>
<p>
If this works already, I'm not sure what you want changed in SANE ?<br>
<p>
<i>&gt; If you want a user interactive mode, the frontend does not need to</i><br>
<i>&gt; know anything about that because the user does press the buttons.</i><br>
<i>&gt; So if the user shall be able to say "next paper" that is not the idea</i><br>
<i>&gt; of ADF. I suggest to add an other scan source "Manual Document Feeder"</i><br>
<i>&gt; or something like that. But we do not need any well known options for</i><br>
<i>&gt; this because the frontend does not do anything automatically!</i><br>
<p>
Mmm. Well, the nice thing about the HP design is that I can write something<br>
to do this, totally automatically, and without behaviour I don't know<br>
about behind the scenes. I'd like this preserved, but it's fine if this<br>
works just when source == MANUAL or whatever.<br>
<p>
while (we've got some sheets left) {<br>
load another sheet<br>
quick-preview-scan<br>
auto-select scan area (just call lists) and brightness/ contrast<br>
high-resolution-scan &gt; file<br>
}<br>
<p>
<i>&gt; &gt; Also, Oliver: Does the Umax way give you separate scan data for each</i><br>
<i>&gt; &gt; sheet, or does the user/app have to cut it up post-scan?</i><br>
<i>&gt; </i><br>
<i>&gt; You get one image per page!</i><br>
<i>&gt; You call SANE_START, the scanner loads the page and scans the selected area.</i><br>
<i>&gt; Second SANE_START produces next image.</i><br>
<p>
Does this mean that the UMAX can really load and unload pages, but you<br>
choose not to export this behaviour from the backend?<br>
<p>
Can I do this (below) with the design you have in mind?<br>
<p>
1. Put phone bill (35 sheets) into hopper, run Xsane<br>
2. Scan in first sheet, hand-tune brightness and scan area in Preview<br>
3. Do a final scan on that first sheet, check it for problems<br>
4. Tell Xsane "Scan all the remaining sheets with those settings"<br>
5. Go and have coffee<br>
<p>
ALSO: Can I do this *without* XSane, in a shell script or OCR program?<br>
<p>
Nick.<br>
<p>
<p>
<pre>
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<li> <b>Next message:</b> <a href="0194.html">Oliver Rauch: "Re: Document Feeders (was Re: Anyone with a Umax Document Feeder?)"</a>
<li> <b>Previous message:</b> <a href="0192.html">Hugo van der Kooij: "Re: sane-1.0.1 available for SCO UnixWare 7.1"</a>
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