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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="Tue Dec 12 11:52:46 2000" -->
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<!-- name="Stephen Williams" -->
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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=<200012121956.LAA10426@icarus.com>"><EM>steve@icarus.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Dec 12 2000 - 11:56:49 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0132.html">Tobias Nijweide: "HP5300C mini HowTo"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0130.html">Oliver Rauch: "sane-pre1-1.0.4 available"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0127.html">Marko Cebokli: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0135.html">Steve Underwood: "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="0135.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0145.html">Marko Cebokli: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<A HREF="mailto:s57uuu@hamradio.si?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<200012121956.LAA10426@icarus.com>">s57uuu@hamradio.si</A> said:
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<BR>
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<EM>> (Yes, it's 3 - the luminance sensors (the 'rods') have the same
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</EM><BR>
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<EM>> sensitivity as the 'green' channel 'cones')
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</EM><BR>
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<P>Not quite, they respond to a wider spectrum then the green sensors.
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<BR>
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Though they are highly sensitive to green, they respond to most all
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<BR>
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of the visible color range. I think.
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<BR>
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<P>(Actually, after saying that I'm not really sure how wide the spectral
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<BR>
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response is for luminance, but I do know that luminance calculations
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<BR>
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certainly all include some red and blue, and I presume there is a
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<BR>
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psychological/physiological reason for that.)
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<BR>
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<P><A HREF="mailto:s57uuu@hamradio.si?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<200012121956.LAA10426@icarus.com>">s57uuu@hamradio.si</A> said:
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<BR>
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<EM>> Back to scanning - if you need to get all the info that is in a
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</EM><BR>
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<EM>> photograph ABOUT THE ORIGINAL SCENE, a three channel scanner is
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</EM><BR>
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<EM>> enough, because the original photo process has already reduced it to 3
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</EM><BR>
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<EM>> chans.
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</EM><BR>
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<P>But do the spectra of those three channels cause the RGB sensors in
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<BR>
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your scanner to respond similarly? That's a question for a photography
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<BR>
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expert, I think. All I know is that it can be a real chore finding the
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<BR>
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right combination of light, sensor and filters just to get white paper
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<BR>
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to come out right. Been there, struggled with that.
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<BR>
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<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=<200012121956.LAA10426@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=<200012121956.LAA10426@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=<200012121956.LAA10426@icarus.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0132.html">Tobias Nijweide: "HP5300C mini HowTo"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0130.html">Oliver Rauch: "sane-pre1-1.0.4 available"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0127.html">Marko Cebokli: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0135.html">Steve Underwood: "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="0135.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0145.html">Marko Cebokli: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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