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<TITLE>sane-devel: Re: Patch for sane.tex (image 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: Patch for sane.tex (image polarity)">
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<H1>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:%20Patch%20for%20sane.tex%20(image%20polarity)&In-Reply-To=<20001003064239.B24904@ecs.soton.ac.uk>"><EM>njl98r@ecs.soton.ac.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Oct 02 2000 - 22:42:39 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0020.html">Henning Meier-Geinitz: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0020.html">Henning Meier-Geinitz: "Re: Patch for sane.tex (image polarity)"</A>
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<P>
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On Sat, Sep 30, 2000 at 07:56:25PM -0700, David Mosberger-Tang wrote:
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<BR>
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<EM>> >>>>> On Sat, 30 Sep 2000 17:13:15 +0200, Henning Meier-Geinitz <<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20Patch%20for%20sane.tex%20(image%20polarity)&In-Reply-To=<20001003064239.B24904@ecs.soton.ac.uk>">hmg-ml@gmx.de</A>> said:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Henning> For all other bit depths, larger values mean more red,
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</EM><BR>
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<EM>> Henning> green, blue, or white.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> This is potentially very confusing. Depending on whether you're
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</EM><BR>
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<EM>> dealing with a subtractive or additive color synthesis, "more color"
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</EM><BR>
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<EM>> could mean darker or brighter, respectively. I no expert in color
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</EM><BR>
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<EM>> theory, but perhaps "larger values correspond to more luminous
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</EM><BR>
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<EM>> (``brighter'') pixels" would be more accurate and but still clear?
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</EM><BR>
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<P>No experts here, I will crib from the TIFF documentation, while trying
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<BR>
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to stay with SANE's terminology. Actually I think there's little risk
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<BR>
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of people trying to do image acquisition with subtractive color models
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<BR>
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(think about it). How about:
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<BR>
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<P>In frames of type SANE_FRAME_GRAY, when the bit depth is 1 there are
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<BR>
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only two sample values possible, 1 represents minimum intensity (black)
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<BR>
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and 0 represents maximum intensity (white).
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<BR>
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For all other bit depth and frame type combinations, a sample value of 0
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<BR>
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represents minimum intensity and larger values represent increasing
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<BR>
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intensity.
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<BR>
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<P>(I think TIFFs choice of vocabulary "intensity" is appropriate because
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<BR>
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just what /is/ brighter about more xray radiation or infrared?)
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<BR>
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<P>Actually, can anyone tell me (from practical experience) whether I
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<BR>
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am right that this only affects SANE_FRAME_GRAY? Do we have devices
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<BR>
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that actually send 1bit RGB frames?
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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:%20Patch%20for%20sane.tex%20(image%20polarity)&In-Reply-To=<20001003064239.B24904@ecs.soton.ac.uk>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0020.html">Henning Meier-Geinitz: "Re: Patch for sane.tex (image polarity)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0020.html">Henning Meier-Geinitz: "Re: Patch for sane.tex (image polarity)"</A>
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