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<TITLE>sane-devel: Re: Which scanners REALLY provide 36 bit output? HP?</TITLE>
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<META NAME="Author" CONTENT="Marko Cebokli (s57uuu@hamradio.si)">
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<META NAME="Subject" CONTENT="Re: Which scanners REALLY provide 36 bit output? HP?">
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<H1>Re: Which scanners REALLY provide 36 bit output? HP?</H1>
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<!-- received="Tue Dec 12 08:20:54 2000" -->
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<!-- isoreceived="20001212162054" -->
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<!-- sent="Tue, 12 Dec 2000 16:29:49 +0000" -->
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<!-- name="Marko Cebokli" -->
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<!-- subject="Re: Which scanners REALLY provide 36 bit output? HP?" -->
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<STRONG>From:</STRONG> Marko Cebokli (<A HREF="mailto:s57uuu@hamradio.si?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<3A36527D.6240ED11@hamradio.si>"><EM>s57uuu@hamradio.si</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Dec 12 2000 - 08:29:49 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0128.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0126.html">erasmo perez: "OpticPro 9630"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0123.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0128.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0071.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0128.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0131.html">Stephen Williams: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<P>
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Bob Washburne wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Stephen Williams wrote:
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Imagine if hearing could be similarly tricked using only three pitches:-)
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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>> I think it already has been.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> There was a game (Barbie ?) for the old Commodoore 64 in which Ken calls
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</EM><BR>
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<EM>> Barbie up for a date and she has to go shopping for a new outfit.
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</EM><BR>
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<EM>> Anyway, Ken and Barbie both had nice digitised voices. Beachhead II
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</EM><BR>
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<EM>> also had good voice digitization.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> But the only sound available for the C64 was a simple synthesizer which
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</EM><BR>
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<EM>> produced square, triangle, sawtooth and noise. These were combined very
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</EM><BR>
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<EM>> nicely (the audio equivilent of RGB) to reproduce recorded speach.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> That what you mean?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Bob Washburne
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</EM><BR>
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<P>Hello,
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<BR>
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<P>That was done using PWM, a time-domain technique.
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<BR>
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You can't do it in frequency domain, because the ear is a several 1000
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<BR>
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channel analyzer versus 3 channels of the eye. (Yes, it's 3 - the
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<BR>
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luminance sensors (the 'rods') have the same sensitivity as the 'green'
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<BR>
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channel 'cones')
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<BR>
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<P>Back to scanning - if you need to get all the info that is in a
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<BR>
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photograph ABOUT THE ORIGINAL SCENE, a three channel scanner is enough,
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<BR>
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because the original photo process has already reduced it to 3 chans.
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<BR>
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By using a multispectral scanner, you'll only get more info about the
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<BR>
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spectral shapes of the pigments (dyes) that make up the photo.
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<BR>
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<P>But I suspect that those 19th century photos are single-channel anyway?
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<BR>
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<P>Marko Cebokli
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<BR>
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<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:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<3A36527D.6240ED11@hamradio.si>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0128.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0126.html">erasmo perez: "OpticPro 9630"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0123.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0128.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0071.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0128.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0131.html">Stephen Williams: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Tue Dec 12 2000 - 08:24:03 PST</EM>
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