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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="Nick Lamb (njl98r@ecs.soton.ac.uk)">
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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="Thu Dec 7 21:44:25 2000" -->
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<STRONG>From:</STRONG> Nick Lamb (<A HREF="mailto:njl98r@ecs.soton.ac.uk?Subject=Re:%20Which%20scanners%20REALLY%20provide%2036%20bit%20output?%20HP?&In-Reply-To=<20001208054545.A2515@ecs.soton.ac.uk>"><EM>njl98r@ecs.soton.ac.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Dec 07 2000 - 21:45:45 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0058.html">Paul Floyd: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0056.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0056.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="0058.html">Paul Floyd: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<P>
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On Fri, Dec 08, 2000 at 12:17:17AM -0500, Bob Washburne wrote:
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<BR>
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<EM>> Scan a small image with bit depth set to 12 and save it as a png file.
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</EM><BR>
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<EM>> Then look at that file with gimp and examine its properties. I believe
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</EM><BR>
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<EM>> gimp will tell you what the color depth is. That should pretty much
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</EM><BR>
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<EM>> confirm what is happening.
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</EM><BR>
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<P>Nope. "Consumer-grade" Gimp is an 8 bit per channel app, through to
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<BR>
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the core. You can load a 16-bit PNG image, but the color accuracy
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<BR>
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will be silently truncated. No ordinary releases of Gimp will include
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<BR>
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higher color accuracy for some time yet, mostly because so few people
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<BR>
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need it.
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<BR>
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<P>If you want to do image processing of very accurate, very high res.
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<BR>
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images you should probably check out VIPS instead of, or as well as
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<BR>
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Gimp.
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<BR>
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<P>Using file(1) should enable you to detect if a PNG image is 8-bit or
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<BR>
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16-bit per sample. Note that not all SANE frontends can output more
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<BR>
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than 8-bits per sample anyway, I think XSane can.
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<BR>
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<P>Both PNG and SANE only transport 8 bit or 16 bit units, so if the
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<BR>
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scanner is capable of any amount greater than 8 bits per sample, the
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<BR>
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results are dynamically scaled to fill a 16-bit sample, this process
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<BR>
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is of course reversible (see sBIT documentation).
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<BR>
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<P>Nick.
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<BR>
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<P><PRE>
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--
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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=<20001208054545.A2515@ecs.soton.ac.uk>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0058.html">Paul Floyd: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0056.html">Bob Washburne: "Re: Which scanners REALLY provide 36 bit output? HP?"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0056.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="0058.html">Paul Floyd: "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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