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<TITLE>sane-devel: Re: Patch for sane.tex (image polarity)</TITLE>
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<META NAME="Author" CONTENT="abel deuring (a.deuring@satzbau-gmbh.de)">
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<META NAME="Subject" CONTENT="Re: Patch for sane.tex (image polarity)">
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<H1>Re: Patch for sane.tex (image polarity)</H1>
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<!-- subject="Re: Patch for sane.tex (image polarity)" -->
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<STRONG>From:</STRONG> abel deuring (<A HREF="mailto:a.deuring@satzbau-gmbh.de?Subject=Re:%20Patch%20for%20sane.tex%20(image%20polarity)&In-Reply-To=<39DB021E.A8DD78BE@satzbau-gmbh.de>"><EM>a.deuring@satzbau-gmbh.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Oct 04 2000 - 03:10:38 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0043.html">Sebastien Sable: "Re: [SnapScan] Acer 300/310/610 and wine debugging"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0041.html">Marcel Pol: "RE: news from microtek2 backend"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0026.html">Henning Meier-Geinitz: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0048.html">Nick Lamb: "12bit (was 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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<LI><STRONG>Reply:</STRONG> <A HREF="0048.html">Nick Lamb: "12bit (was Re: Patch for sane.tex (image polarity))"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0049.html">John Vickers: "Re: Patch for sane.tex (image polarity)"</A>
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<HR NOSHADE><P>
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<P>
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Henning Meier-Geinitz wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> On Tue, Oct 03, 2000 at 02:48:56PM +0200, Oliver Rauch wrote:
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</EM><BR>
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<EM>> > as far as I know there is no 1 bit color frame or image format defined.
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</EM><BR>
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<EM>> > I can imagine how this would look like in 3 pass scanning mode,
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</EM><BR>
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<EM>> > but there is (as far as I know) no interleaved RGB 1 bit format.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> You may be right concerning image formats (like pnm, tiff, ...). The SANE
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</EM><BR>
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<EM>> standard explicitly allows this case (->byte interleaved).
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > May be we should use the 8 bit format for it.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Definitely. If somebody really needs 1-bit color ...
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</EM><BR>
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<P>The scanners supported by the Sharp backend can produce 1 bit RGB data,
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<BR>
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and the backend supports the scan mode. But it expands the 1 bit data
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<BR>
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into 8 bits, because [x]scanimage simply copies the data received from
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<BR>
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the backend into the output, with a PNM header in front. And a RGB
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<BR>
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format with 1 bit per colour is apparently not supported by the "PNM
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<BR>
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programs", at least in the format delivered by the Sane programs.
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<BR>
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<P>Therefore, I suggest, that the Sane standard should simply state that
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<BR>
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RGB data should have at least 8 bits per colour. A smaller bit depth is
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<BR>
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hardly of an use at a time, where you can buy a 20 GB hard disk for
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<BR>
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$200, so the only thing needed is a clarification of the standard.
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<BR>
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<P>(BTW, what happens, if [x]scanimage receives RGB data with, say, 12 bit
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<BR>
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per colour? Is such a format handled properly by PNM programs or Gimp?)
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<BR>
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<P>Abel
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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:%20Patch%20for%20sane.tex%20(image%20polarity)&In-Reply-To=<39DB021E.A8DD78BE@satzbau-gmbh.de>">majordomo@mostang.com</A>
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</PRE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0043.html">Sebastien Sable: "Re: [SnapScan] Acer 300/310/610 and wine debugging"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0041.html">Marcel Pol: "RE: news from microtek2 backend"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0026.html">Henning Meier-Geinitz: "Re: Patch for sane.tex (image polarity)"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0048.html">Nick Lamb: "12bit (was 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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<LI><STRONG>Reply:</STRONG> <A HREF="0048.html">Nick Lamb: "12bit (was Re: Patch for sane.tex (image polarity))"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0049.html">John Vickers: "Re: Patch for sane.tex (image polarity)"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Wed Oct 04 2000 - 03:02:46 PDT</EM>
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