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<TITLE>sane-devel: 12bit (was Re: Patch for sane.tex (image polarity))</TITLE>
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<H1>12bit (was Re: Patch for sane.tex (image polarity))</H1>
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<STRONG>From:</STRONG> Nick Lamb (<A HREF="mailto:njl98r@ecs.soton.ac.uk?Subject=Re:%2012bit%20(was%20Re:%20Patch%20for%20sane.tex%20(image%20polarity))&In-Reply-To=<20001004204033.B1935@ecs.soton.ac.uk>"><EM>njl98r@ecs.soton.ac.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Oct 04 2000 - 12:40:33 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0049.html">John Vickers: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0047.html">Lawrence Glaister: "Re: The problem of xscanimage by CanoscanFB620S"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0042.html">abel deuring: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0049.html">John Vickers: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0027.html">David Mosberger-Tang: "Re: Patch for sane.tex (image polarity)"</A>
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On Wed, Oct 04, 2000 at 12:10:38PM +0200, abel deuring wrote:
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<BR>
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<EM>> (BTW, what happens, if [x]scanimage receives RGB data with, say, 12 bit
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</EM><BR>
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<EM>> per colour? Is such a format handled properly by PNM programs or Gimp?)
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</EM><BR>
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<P>Can't happen. The SANE standard specifies 1bit, 8bit and 16bit only.
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<BR>
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<P>A backend which sends 12 bits per sample is broken. A backend which sends
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12 bits wrapped as 16 bits (with leading 000s) is broken. "36 bit" scanner
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<BR>
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data is multiplied (or at least shifted) to fill the dynamic range of
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<BR>
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16 bit samples before going over SANE. See (many) previous discussions
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<BR>
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in the list archives.
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<BR>
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<P>I don't know how PNM handles 16 bit, but Gimp provides only 8 bit samples
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<BR>
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and frontends like XSane and XScanimage are expected (required actually)
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<BR>
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to downsample if necessary before passing the data to Gimp.
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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:%2012bit%20(was%20Re:%20Patch%20for%20sane.tex%20(image%20polarity))&In-Reply-To=<20001004204033.B1935@ecs.soton.ac.uk>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0049.html">John Vickers: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0047.html">Lawrence Glaister: "Re: The problem of xscanimage by CanoscanFB620S"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0042.html">abel deuring: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0049.html">John Vickers: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0027.html">David Mosberger-Tang: "Re: Patch for sane.tex (image polarity)"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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