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<TITLE>sane-devel: Re: some technical questions</TITLE>
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<H1>Re: 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.4.20.0101191057390.29015-100000@node2.localnet.net>"><EM>volodya@mindspring.com</EM></A><BR>
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<STRONG>Date:</STRONG> Fri Jan 19 2001 - 08:02:47 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0201.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0199.html">Marcel Pol: "Re: False Colors with Microtek Scanmaker X6 SCSI"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0201.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0196.html">dave-mlist@bfnet.com: "Failed to open device `coolscan:/dev/scanner': Device busy."</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0201.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<P>
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On Thu, 18 Jan 2001, Henning Meier-Geinitz wrote:
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<BR>
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<P><EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> On Thu, Jan 18, 2001 at 03:54:31PM -0500, <A HREF="mailto:volodya@mindspring.com?Subject=Re:%20some%20technical%20questions&In-Reply-To=<Pine.LNX.4.20.0101191057390.29015-100000@node2.localnet.net>">volodya@mindspring.com</A> wrote:
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</EM><BR>
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<EM>> > * I think I found 3 sets of data that looks like gamma. Does it make
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</EM><BR>
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<EM>> > sense ?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Yes, that may be ok for color mode. Most scanners I use have 4096
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</EM><BR>
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<EM>> bytes of gamma (per color) so they use a mapping of 4096->256.
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>That's exactly how it is here as well.
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<BR>
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<P><EM>> > * The scanner is said to be 30 (or 32 ?) bit but I only get 24bit data
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</EM><BR>
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<EM>> > is it supposed to be so ?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> That's probably marketing speech. The 30 (or 36, 48) bits are used
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</EM><BR>
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<EM>> internally. After calibration + gamma correction 24 bits are returned
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</EM><BR>
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<EM>> to the computer. Some scanners allow to transmit the raw data with the
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</EM><BR>
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<EM>> higher bits/pixel but then calibration/gamma isn't used (at least in
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</EM><BR>
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<EM>> my experience).
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</EM><BR>
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<P>I don't think it's worth trying to find out then.
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<BR>
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It is a USB scanner. It has bandwidth problems at 600x600dpi already.
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> > * there are also some registers that drive the motor - I can use them
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</EM><BR>
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<EM>> > but if there are some general ideas about how they should work I'll
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</EM><BR>
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<EM>> > be happy to listen
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> That's quite dependent on the chip the scanner uses. Maybe it helps to
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</EM><BR>
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<EM>> look at a paper about stepper motors.
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</EM><BR>
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<EM>>
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</EM><BR>
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Could you e-mail me a link ?
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<BR>
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<P><EM>> > * I don't understand how sensor is switched from 75dpi mode to higher
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</EM><BR>
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<EM>> > dpi mode. (i.e. I can drive the carriage at different resolutions,
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</EM><BR>
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<EM>> > but I don't know how to get the sensor to output higher precision
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</EM><BR>
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<EM>> > data)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> As far as I see at the Mustek scanners the sensor always scans at the
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</EM><BR>
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<EM>> maximum resolution. Only the data is reduced somewhere in the scanner
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</EM><BR>
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<EM>> when lower resolutions are used.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Can I add an entry in the PROJECTS file of SANE for you? So no work is
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</EM><BR>
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<EM>> duplicated.
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</EM><BR>
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<P>Yep. Also - is there any central place I could store the test program I
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<BR>
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wrote ? Instead of starting yet another project on Sourceforge.
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> Is the chip(set) used by canon produced by them or from another vendor?
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Have no idea. I have not seen similar scanner though, so it must be them.
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<BR>
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It is actually a very nice scanner (2400x1200) and is completely USB
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<BR>
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powered. One drawback are some kind of moire pattern when you scan black
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<BR>
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and white line art (though one can get rid of it rather easily).
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<BR>
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<P> Vladimir Dergachev
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> Bye,
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</EM><BR>
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<EM>> Henning
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>> Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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</EM><BR>
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<EM>> To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20some%20technical%20questions&In-Reply-To=<Pine.LNX.4.20.0101191057390.29015-100000@node2.localnet.net>">majordomo@mostang.com</A>
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</EM><BR>
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<EM>>
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</EM><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.4.20.0101191057390.29015-100000@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="0201.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0199.html">Marcel Pol: "Re: False Colors with Microtek Scanmaker X6 SCSI"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0189.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0201.html">Henning Meier-Geinitz: "Re: some technical questions"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0196.html">dave-mlist@bfnet.com: "Failed to open device `coolscan:/dev/scanner': Device busy."</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0201.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>Fri Jan 19 2001 - 08:03:33 PST</EM>
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