sane-project-website/old-archive/1999-08/0130.html

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<!-- name="Andreas Beck" -->
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<!-- subject="Re: Starting a discussion about SANE and TWAIN..." -->
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<title>sane-devel: Re: Starting a discussion about SANE and TWAIN...</title>
<h1>Re: Starting a discussion about SANE and TWAIN...</h1>
<b>Andreas Beck</b> (<a href="mailto:becka@rz.uni-duesseldorf.de"><i>becka@rz.uni-duesseldorf.de</i></a>)<br>
<i>Fri, 13 Aug 1999 22:37:09 +0200</i>
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Hi Nick !<br>
<p>
You seem to have a sufficient insight of both TWAIN and SANE.<br>
<p>
You don't happen to be interested to code something ? :-)<br>
<p>
<i>&gt; &gt; &gt; If I read correctly Andy stated that it is possible to have </i><br>
<i>&gt; &gt; &gt; something like a TWAIN backend for SANE. </i><br>
<i>&gt; &gt; No. To my knowledge, this is not possible.</i><br>
<p>
<i>&gt; This IS possible, but only for TWAIN sources which comply with some of</i><br>
<i>&gt; the most recent additions to the TWAIN standards (in relative terms,</i><br>
<i>&gt; the original TWAIN is now quite old). In particular when I asked about</i><br>
<i>&gt; this I was told that few if any mass-market scanners have the necessary</i><br>
<i>&gt; TWAIN features to do SANE-on-TWAIN. Such "high-end" features are</i><br>
<i>&gt; unfortunately optional :(</i><br>
<p>
Uh - yes. I should have stated that more clearly. The point you make came up<br>
on the ML here in the past. However as you say, it's probably not worth the<br>
bother to implement it, as the number of working sources for the system<br>
would be very limited.<br>
<p>
<i>&gt; However, the other way around TWAIN-on-SANE would be comparatively easy</i><br>
<i>&gt; to do, and would work with every existing SANE backend, though not</i><br>
<i>&gt; necessarily to maximum advantage. </i><br>
<p>
Yes. What is your opinion about that ?<br>
<p>
I would suggest to add an exported API to the existing SANE frontends, like<br>
a common commandline option that will make it connect to some pipe or<br>
something. That allows to use any backend as the hardware driver, and any<br>
frontend (the exports the "remote control" interface) as the GUI driver.<br>
<p>
The TWAIN library itself could then work similar to what the GIMP does.<br>
It would look up the command to run in its configuration files and then<br>
call e.g. "xscanimage -twain" (like gimp does with -g) and talk to it.<br>
<p>
The other, less flexible but somewhat simpler possibility would be to <br>
make a single custom TWAIN frontend.<br>
<p>
CU, Andy<br>
<p>
<pre>
-- 
= Andreas Beck                    |  Email :  &lt;<a href="mailto:andreas.beck@ggi-project.org">andreas.beck@ggi-project.org</a>&gt; =
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