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<TITLE>sane-devel: some technical questions</TITLE>
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<H1>some technical questions</H1>
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<STRONG>From:</STRONG> <A HREF="mailto:volodya@mindspring.com?Subject=Re:%20some%20technical%20questions&In-Reply-To=<Pine.LNX.4.20.0101181545570.24766-100000@node2.localnet.net>"><EM>volodya@mindspring.com</EM></A><BR>
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<STRONG>Date:</STRONG> Thu Jan 18 2001 - 12:54:31 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0187.html">Gregory Gulik: "Re: Setting up HP ScanJet 5P on Solaris 8 SPARC"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0187.html">Gregory Gulik: "Re: Setting up HP ScanJet 5P on Solaris 8 SPARC"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<P>
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Hi,
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<BR>
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I am new to the list and I have some technical questions - would be great
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<BR>
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if someone could explain.
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<BR>
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<P> Basically I have a Canon 1220U scanner and snooped on it's USB packets
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<BR>
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and written a small test program that scans at 75dpi (as packets are
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<BR>
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smaller in this case). Now before doing anything else I wonder whether
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<BR>
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someone can explain to me how scanners look to programmer in general
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<BR>
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and how to interpret register data that I have.
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<BR>
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<P> In particular:
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<BR>
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* I think I found 3 sets of data that looks like gamma. Does it make
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<BR>
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sense ?
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<BR>
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* The scanner is said to be 30 (or 32 ?) bit but I only get 24bit data
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<BR>
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is it supposed to be so ?
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<BR>
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* I also have 2 of 3 sets (one for R, G and B) of bitmasks that seem
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<BR>
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to turn sensors on and off. (when bit is unset the data comes in as
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<BR>
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0 ). What are they for ?
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<BR>
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* there are also some registers that drive the motor - I can use them
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<BR>
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but if there are some general ideas about how they should work I'll
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<BR>
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be happy to listen
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<BR>
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* I don't understand how sensor is switched from 75dpi mode to higher
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<BR>
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dpi mode. (i.e. I can drive the carriage at different resolutions,
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<BR>
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but I don't know how to get the sensor to output higher precision
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<BR>
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data)
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<BR>
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<P> thank you very much
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<BR>
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<P> Vladimir Dergachev
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<BR>
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<P><P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20some%20technical%20questions&In-Reply-To=<Pine.LNX.4.20.0101181545570.24766-100000@node2.localnet.net>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0187.html">Gregory Gulik: "Re: Setting up HP ScanJet 5P on Solaris 8 SPARC"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0187.html">Gregory Gulik: "Re: Setting up HP ScanJet 5P on Solaris 8 SPARC"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu Jan 18 2001 - 12:57:37 PST</EM>
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