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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="Steffen Kluge (kluge@fujitsu.com.au)">
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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="Sun Dec 10 17:44:30 2000" -->
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<!-- name="Steffen Kluge" -->
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<STRONG>From:</STRONG> Steffen Kluge (<A HREF="mailto:kluge@fujitsu.com.au?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<20001211124301.A16199@syd0128.fujitsu.com.au>"><EM>kluge@fujitsu.com.au</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Dec 10 2000 - 17:43:01 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0114.html">Warren Young: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0112.html">Jochen Eisinger: "Re: Cannot access my scanner as normal user"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0071.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="0114.html">Warren Young: "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="0114.html">Warren Young: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<P>
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On Sat, Dec 09, 2000 at 11:00:06AM +0800, Steve Underwood wrote:
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<BR>
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<EM>> > represent all the information possible. For 19th century photography I
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</EM><BR>
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<EM>> > believe 1200 dpi comes very close to this.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> This is about the resolution of most modern emulsions (unless you are using
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</EM><BR>
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<EM>> super slow specialist films). I doubt the 19th centruy emulsions have
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</EM><BR>
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<EM>> anything like that resolution. 19th century lenses are incapable of
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</EM><BR>
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<EM>> resolving this well, anyway. Such a high resolution would only make sense
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</EM><BR>
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<EM>> when scanning documents, or maybe paintings.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> The resolution of most film images are much poorer than most people
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</EM><BR>
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<EM>> realise.
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</EM><BR>
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<P>Well, all decent 100ASA slide or negative emulsions are capable
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<BR>
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of recording in excess of 100 lines/mm, at a contrast of
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<BR>
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1:1000. That would be 2500lpi. Good lenses can get across maybe
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<BR>
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about 1200~2000lpi. Keep in mind that the pixels in a film
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<BR>
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emulsion are scattered (and different in size), so you need a
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<BR>
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lot more pixels in an orderly rectangular grid to get the same
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<BR>
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visual resolution.
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<BR>
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<P>Cheers
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<BR>
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Steffen.
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<BR>
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<P><PRE>
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--
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Steffen Kluge <<A HREF="mailto:kluge@fujitsu.com.au?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<20001211124301.A16199@syd0128.fujitsu.com.au>">kluge@fujitsu.com.au</A>>
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Fujitsu Australia Ltd
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Keywords: photography, Mozart, UNIX, Islay Malt, dark skies
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--
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<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=<20001211124301.A16199@syd0128.fujitsu.com.au>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0114.html">Warren Young: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0112.html">Jochen Eisinger: "Re: Cannot access my scanner as normal user"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0071.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="0114.html">Warren Young: "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="0114.html">Warren Young: "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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