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<TITLE>sane-devel: Re: image data format polarity</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: image data format polarity">
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<H1>Re: image data format polarity</H1>
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<STRONG>From:</STRONG> Nick Lamb (<A HREF="mailto:njl98r@ecs.soton.ac.uk?Subject=Re:%20image%20data%20format%20polarity&In-Reply-To=<20000921225014.B522@ecs.soton.ac.uk>"><EM>njl98r@ecs.soton.ac.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Sep 21 2000 - 14:50:14 PDT
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<P>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0222.html">Nick Lamb: "Re: authorization support (TODO list)"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0212.html">Oliver Rauch: "Re: image data format polarity"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0229.html">Oliver Rauch: "Re: image data format polarity"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0229.html">Oliver Rauch: "Re: image data format polarity"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0233.html">Henning Meier-Geinitz: "Re: image data format polarity"</A>
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<P>
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On Thu, Sep 21, 2000 at 03:34:12PM +0200, Oliver Rauch wrote:
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<BR>
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<EM>> Where is the problem?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> It had to defined and it really does not matter in which way.
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</EM><BR>
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<P>It is completely inconsistent. If 1 means black in 1bit, why does it
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<BR>
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mean white in 8bit? How about 16bit? What does it mean for color
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<BR>
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channels? What other horrors will I find when I have time to write
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<BR>
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a more complete set of tests?
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<BR>
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<P><EM>> Does anyone really think it would be a good idea to change an existing
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</EM><BR>
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<EM>> standard in such a point? I don`t think so.
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</EM><BR>
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<P>Chaper, section, subsection reference to the STANDARD please Oliver,
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<BR>
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or do you mean "I don't want to change XSane at this point" ? I do not
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<BR>
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see anything about this mess in the standard, just a clean clear
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<BR>
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description of the various color depths.
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<BR>
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<P><EM>> Where is the sense to discuss about it?
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</EM><BR>
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<P>Well, it looks broken and is definitely inconsistent. "We always did
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<BR>
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the wrong thing" is not a good excuse for doing the wrong thing,
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<BR>
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especially when we're so early in the life of SANE. This will catch
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<BR>
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out everyone who tries to implement the spec from scratch (not by
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<BR>
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cutting and pasting code as most have so far)
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<BR>
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<P>As far as I can see this behaviour comes from using PNM as a testbed
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<BR>
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for SANE (and a very inconsistent and bad testbed it was too, as all
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<BR>
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who examine the resulting code can see for themselves) and it isn't
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<BR>
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codified anywhere in the SANE documentation.
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<BR>
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<P>I would prefer that it be corrected in the implementations and
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<BR>
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clarified in the spec. If not, the spec must be changed to indicate
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<BR>
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how existing implementations do it, with a footnote explaining that
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<BR>
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this is a result of a ridiculous historical artifact.
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<BR>
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<P>If this list comes to a consensus I will arrange for one or the other
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<BR>
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to be in my next draft.
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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:%20image%20data%20format%20polarity&In-Reply-To=<20000921225014.B522@ecs.soton.ac.uk>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0224.html">Dominic Knight: "will my scanner work"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0222.html">Nick Lamb: "Re: authorization support (TODO list)"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0212.html">Oliver Rauch: "Re: image data format polarity"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0229.html">Oliver Rauch: "Re: image data format polarity"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0229.html">Oliver Rauch: "Re: image data format polarity"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0233.html">Henning Meier-Geinitz: "Re: image data format polarity"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu Sep 21 2000 - 14:39:49 PDT</EM>
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