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<H1>Re: Writing Fujitsu M3091 backend</H1>
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<STRONG>From:</STRONG> Tom Martone (<A HREF="mailto:tom@martoneconsulting.com?Subject=Re:%20Writing%20Fujitsu%20M3091%20backend&In-Reply-To=&lt;3A9F03E5.5D88E87B@martoneconsulting.com&gt;"><EM>tom@martoneconsulting.com</EM></A>)<BR>
<STRONG>Date:</STRONG> Thu Mar 01 2001 - 18:22:29 PST
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Greetings,
<BR>
<P><EM>&gt; It does make a difference I think. If the front-end is expected to do
</EM><BR>
<EM>&gt; something automatically - even if it's just saving the images with
</EM><BR>
<EM>&gt; proper names - it would be good to know whether a certain image is
</EM><BR>
<EM>&gt; &quot;another image derived from the same sheet of paper&quot; or &quot;a new image
</EM><BR>
<EM>&gt; derived from a new sheet of paper&quot;. You would probably want to assign
</EM><BR>
<EM>&gt; different file names.
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; Of course it can be &quot;guessed&quot; - if the front-end knows that duplex
</EM><BR>
<EM>&gt; mode is on, every other image that the scanner delivers will probably
</EM><BR>
<EM>&gt; be a back side - but that's not exactly cool. For example I've been
</EM><BR>
<EM>&gt; looking at the Bell+Howell driver and saw that these scanners may
</EM><BR>
<EM>&gt; produce a multitude of images from one page - things like &quot;front
</EM><BR>
<EM>&gt; thumbnail&quot;, &quot;front barcode&quot;, whatever.
</EM><BR>
<P>I agree that it's not exactly cool. The practical way of dealing with
<BR>
it in the Bell+Howell case is that the front-end is in control of
<BR>
requesting which set of possible images can be generated from a sheet
<BR>
of paper, and the driver delivers them in a predictable, documented
<BR>
order. So a front-end program can reliably know which image is it
<BR>
working on at any time.
<BR>
<P><EM>&gt; So, in &quot;some future version&quot; of SANE, there ought to be a mechanism by
</EM><BR>
<EM>&gt; which the backend can inform the front-end of the intrinsic relation-
</EM><BR>
<EM>&gt; ships between images it delivers.
</EM><BR>
<P>Agreed. For now, non-standard, xml-encoded text frames work like a charm.
<BR>
<P>By the way, scanadf can scan only some of the documents in the hopper by
<BR>
using the --start-count and --end-count options. I think xsane has similar
<BR>
capabilities. But in my version of &quot;real-life&quot; these options are never
<BR>
used. The users control how many pages to scan by the size of the stack
<BR>
of sheets that they place in the hopper.
<BR>
<P>Tom
<BR>
<P><PRE>
--
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