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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="Paul Floyd (paulf@free.fr)">
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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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<STRONG>From:</STRONG> Paul Floyd (<A HREF="mailto:paulf@free.fr?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<976267700.3a30a9b43d126@imp.free.fr>"><EM>paulf@free.fr</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Dec 08 2000 - 01:28:20 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0059.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0057.html">Nick Lamb: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0050.html">Bob Washburne: "Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Next in thread:</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="0059.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0062.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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Quoting Bob Washburne <<A HREF="mailto:rcwash@concentric.net?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<976267700.3a30a9b43d126@imp.free.fr>">rcwash@concentric.net</A>>:
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<BR>
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<P><P><EM>> So, can anybody out there identify a scanner which can *REALLY* output
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</EM><BR>
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<EM>> 36 bpp? If I scan an immage which is 2"x2" at 1200 dpi will I actually
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</EM><BR>
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<EM>> get a file over 8.6 MB in size? And I'll be able to achieve that with
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</EM><BR>
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<EM>> xSANE or even the software which came with the scanner?
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</EM><BR>
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<P>Well, let's do some sums. 1200dpi, 2"x2" and 36bpp (4.5bytes)
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<BR>
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gives (1200x2)x(1200x2)x4.5 = 25,920,000 uncompressed bytes.
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<BR>
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<P>Depending on the content of the image (and the image format/compression
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<BR>
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ratio used) then I'd expect 15-20Mbytes. If you want 12bit greyscale,
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<BR>
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then I'd expect 1/3 of that size, or 8.6M uncompressed, 4-6M compressed.
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<BR>
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You can always get smaller files if you use a lossy compression format,
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<BR>
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and you're willing to lose a bit more (but then, why bother having such
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<BR>
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a high resolution?).
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<BR>
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<P>What are you going to be doing with these images? Visualizing them
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<BR>
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won't be easy (they're certainly well beyond the scope of most
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<BR>
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monitors and printers). Unless you're doing research or doing high
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<BR>
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quality commercial printing, then 1200bpi/36bpp is overkill.
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<BR>
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<P>Regards
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<BR>
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Paul
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<BR>
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<PRE>
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--
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Paul Floyd <A HREF="http://paulf.free.fr">http://paulf.free.fr</A> for those with time to waste
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What's the point? The sharp thing on the end.
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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=<976267700.3a30a9b43d126@imp.free.fr>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0059.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0057.html">Nick Lamb: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0050.html">Bob Washburne: "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="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="0059.html">Steve Underwood: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0062.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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