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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="Stephen Williams (steve@icarus.com)">
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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="Fri Dec 8 15:11:08 2000" -->
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<!-- name="Stephen Williams" -->
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<!-- subject="Re: Which scanners REALLY provide 36 bit output? HP?" -->
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<!-- inreplyto="3A310ACA.E52F766D@concentric.net" -->
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<STRONG>From:</STRONG> Stephen Williams (<A HREF="mailto:steve@icarus.com?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<200012082312.PAA25068@icarus.com>"><EM>steve@icarus.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Dec 08 2000 - 15:12:32 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0067.html">Denny Lee: "HP Scanjet 5 qustion"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0065.html">Henning Meier-Geinitz: "snapscan.desc and Snapscan website"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0062.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="0068.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="0059.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0068.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0073.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0123.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<A HREF="mailto:rcwash@concentric.net?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<200012082312.PAA25068@icarus.com>">rcwash@concentric.net</A> said:
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<BR>
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<EM>> While it may be impractical to preserve the original document (these
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</EM><BR>
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<EM>> are family records, not national treasures) it should be possible to
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</EM><BR>
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<EM>> scan them and preserve their information. Once digitised, they can be
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</EM><BR>
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<EM>> copied ad infinitum with no loss in quality.
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</EM><BR>
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<P>A couple issues that may well already know.
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<BR>
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<P>First, there is not just the resolution to think about but the spectral
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<BR>
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response of the scanner. It is fiendishly difficult to get the right
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<BR>
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combination of illumination, color filters, optics and CCD to make most
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<BR>
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colors come out right. I wonder if consumer scanners can cope at the
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<BR>
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level you seem to be asking for.
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<BR>
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<P>Second, it is not theoretically possible to "accurately reproduce
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<BR>
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color." Perfectly accurate "color" has a continuous spectrum that would
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<BR>
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require a near infinite number of channels to reproduce. All scanning,
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<BR>
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printing and color display depend on the human perceptual trick that aliases
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<BR>
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many colors together. It is a miraculous stroke of technical luck that most
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<BR>
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color perceptions can be aliased to colors produced from small sets of
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<BR>
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primaries.
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<BR>
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<P>Imagine if hearing could be similarly tricked using only three pitches:-)
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<BR>
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<P><PRE>
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--
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Steve Williams "The woods are lovely, dark and deep.
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<A HREF="mailto:steve@icarus.com?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<200012082312.PAA25068@icarus.com>">steve@icarus.com</A> But I have promises to keep,
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<A HREF="mailto:steve@picturel.com?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<200012082312.PAA25068@icarus.com>">steve@picturel.com</A> and lines to code before I sleep,
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<A HREF="http://www.picturel.com">http://www.picturel.com</A> And lines to code before I sleep."
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<P><P><P>--
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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=<200012082312.PAA25068@icarus.com>">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="0067.html">Denny Lee: "HP Scanjet 5 qustion"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0065.html">Henning Meier-Geinitz: "snapscan.desc and Snapscan website"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0062.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0068.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="0059.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0068.html">Ian Stirling: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0073.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0123.html">Bob Washburne: "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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