sane-project-website/old-archive/1999-08/0180.html

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<!-- name="Nick Lamb" -->
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<title>sane-devel: Re: SANE frames</title>
<h1>Re: SANE frames</h1>
<b>Nick Lamb</b> (<a href="mailto:njl98r@ecs.soton.ac.uk"><i>njl98r@ecs.soton.ac.uk</i></a>)<br>
<i>Sun, 15 Aug 1999 23:16:46 +0100 (GMT)</i>
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On Sun, 15 Aug 1999, Tom Martone wrote:<br>
<p>
<i>&gt; I think that number 3) would be a bug and would need to be fixed, </i><br>
<i>&gt; because by prepending the header to the unknown frame, the front-end</i><br>
<i>&gt; will have effectively corrupted the data stream.</i><br>
<p>
Yes. It's wrong behaviour to pretend you understand unknown formats --<br>
If you can't think of anything better to do: Scream and Shout and<br>
Stamp your feet so that the user knows something is wrong.<br>
<p>
<i>&gt; NOTE: This is how I understand scanimage behavior when encountering</i><br>
<i>&gt;   an unexpected frame type:</i><br>
<i>&gt; </i><br>
<i>&gt; 1) if the FRAME does not need to be buffered (lines &gt;= 0)</i><br>
<i>&gt;    The output will be the raw data with a PNM header prepended.</i><br>
<i>&gt; 2) if the FRAME needs buffering (lines &lt; 0, size not known a-priori)</i><br>
<i>&gt;    The output will be a PNM header only.</i><br>
<i>&gt; </i><br>
<i>&gt; Niether one of these is useful behavior and would necessitate a minor</i><br>
<i>&gt; change to scanimage.  I'll volunteer to make that change.  </i><br>
<p>
Sounds good. Presumably you'll spit the raw data straight out onto the<br>
stdout file decriptor? That way:<br>
<p>
scanimage -d interesting:jpeg-device &gt; buttercup.jpg<br>
Gets you a JPEG in buttercup.jpg ready for further processing<br>
<p>
Nick.<br>
<p>
<p>
<pre>
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