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 <H1>Re: Which scanners REALLY provide 36 bit output? HP?</H1>
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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=&lt;3A3B8B72.4AA3A84B@hamradio.si&gt;"><EM>s57uuu@hamradio.si</EM></A>)<BR>
 <STRONG>Date:</STRONG> Sat Dec 16 2000 - 07:34:10 PST
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 Steve Underwood wrote:
 <BR>
 <EM>&gt;
 </EM><BR>
 <EM>&gt; What you need is not more bits. You need a spectral shift. Your stained documents
 </EM><BR>
 <EM>&gt; might really come alive, if you look at them through a part of the spectrum we
 </EM><BR>
 <EM>&gt; cannot see well. You may find colours (probably in the IR band) where the stains
 </EM><BR>
 <EM>&gt; don't show at all, and the text is beautifully clear.  If you try an IR filter you
 </EM><BR>
 <EM>&gt; might get interesting results. Most glasses will pass the high end of the IR band,
 </EM><BR>
 <EM>&gt; and I think the CCD in the scanner will respond OK when you do a black and white
 </EM><BR>
 <EM>&gt; scan. If you can find a suitable filter, its worth a try.
 </EM><BR>
 <EM>&gt;
 </EM><BR>
 <P>The best way for a quick experiment would probably be to use one of
 <BR>
 those old BW (handheld) scanners that have used red LEDs for
 <BR>
 illumination.
 <BR>
 Just replace the red LEDs with IR ones. You can find IR LEDs with
 <BR>
 dominant wavelengths between 800 and 950 nm. (TV remote stuff)
 <BR>
 <P>These scanners usually employ arrays of miniature SMD LEDs, so you'll
 <BR>
 need a steady hand for soldering :-)
 <BR>
 <P>The CCD chips actually have their peak sensitivity in the near IR in the
 <BR>
 same range, but it falls sharply below one micron, being quasi zero
 <BR>
 at 1100 nm.
 <BR>
 <P>A color scanner won't be adequate, because those have special IR
 <BR>
 blocking filters to prevent color falsification by the IR light.
 <BR>
 (or else the RGB color separation filters themselves are IR blocking)
 <BR>
 Selecting a BW scan on a color scanner doesn't change this.
 <BR>
 <P>Documents printed with old soot-containing inks should be nice in IR,
 <BR>
 but I'm not sure if modern color-process inks have any contrast in IR?
 <BR>
 <P>A quick way to see this would be to use a night-vision device and your
 <BR>
 TV remote as a torch in a dark room.
 <BR>
 <P>Enough crazy ideas -
 <BR>
 <P>regards,
 <BR>
 Marko Cebokli
 <BR>
 <P><PRE>
 --
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 <LI><STRONG>Previous message:</STRONG> <A HREF="0178.html">Ben Millhouse: "RE: [snapscan] Vuego 620S and ACARD scsi card"</A>
 <LI><STRONG>In reply to:</STRONG> <A HREF="0177.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="0188.html">Nick Lamb: "Waaay off topic (was Re: Which scanners REALLY provide 36 bit output? HP?)"</A>
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136 wiersze 5.5 KiB HTML Czysty Bezpośredni odnośnik Wina Historia

136 wiersze

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Czysty Bezpośredni odnośnik Wina Historia