kopia lustrzana https://gitlab.com/sane-project/website
115 wiersze
4.9 KiB
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115 wiersze
4.9 KiB
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<!-- received="Mon Aug 30 10:46:08 1999 PDT" -->
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<!-- sent="Mon, 30 Aug 1999 19:32:57 +0200" -->
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<!-- name="Oliver Rauch" -->
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<!-- email="oliver.rauch@Wolfsburg.DE" -->
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<!-- subject="Re: SANE V2 - again..." -->
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<!-- inreplyto="SANE V2 - again..." -->
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<title>sane-devel: Re: SANE V2 - again...</title>
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<h1>Re: SANE V2 - again...</h1>
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<b>Oliver Rauch</b> (<a href="mailto:oliver.rauch@Wolfsburg.DE"><i>oliver.rauch@Wolfsburg.DE</i></a>)<br>
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<i>Mon, 30 Aug 1999 19:32:57 +0200</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#344">[ date ]</a><a href="index.html#344">[ thread ]</a><a href="subject.html#344">[ subject ]</a><a href="author.html#344">[ author ]</a>
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<li> <b>Next message:</b> <a href="0345.html">Oliver Rauch: "Re: SANE V2 - again..."</a>
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<li> <b>Previous message:</b> <a href="0343.html">abel deuring: "Re: SANE V2 - again..."</a>
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<li> <b>Maybe in reply to:</b> <a href="0327.html">abel deuring: "SANE V2 - again..."</a>
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<li> <b>Next in thread:</b> <a href="0345.html">Oliver Rauch: "Re: SANE V2 - again..."</a>
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</ul>
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Milon Firikis wrote:<br>
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<p>
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<i>> Oliver Rauch wrote:</i><br>
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<i>> ></i><br>
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<i>> ></i><br>
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<i>> > Hi,</i><br>
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<i>> ></i><br>
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<i>> > the gamma tables should be well known options, may be the halftone patterns too,</i><br>
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<i>> ></i><br>
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<i>> > we should add that to the next sane standard.</i><br>
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<i>> ></i><br>
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<i>> > For what do you need the calibration vector in the frontend, that should be</i><br>
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<i>> > handled only in the backend.</i><br>
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<i>> ></i><br>
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<i>> > If we want to add color correction as a "midend" it could be interesting</i><br>
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<i>> > to add a well known option for the color correction matrix (3x3).</i><br>
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<i>> > But this could also be done in a frontend, that does not make much</i><br>
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<i>> > work so I would'nt write a midend for it.</i><br>
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<i>> ></i><br>
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<i>> > Bye</i><br>
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<i>> > Oliver</i><br>
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<i>> ></i><br>
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<i>></i><br>
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<i>> Halo Oliver,</i><br>
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<i>></i><br>
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<i>> Apple scanners allow download able</i><br>
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<i>> Halftone patterns,</i><br>
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<i>> Color Correction Tables,</i><br>
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<i>> Calibration Vectors,</i><br>
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<i>> Gamma Tables</i><br>
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<i>></i><br>
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<i>> Are you sure you can do the work in some midend or frontend for all of</i><br>
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<i>> them?</i><br>
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<i>> -For Gamma definitely not</i><br>
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<i>> -For HalfTone</i><br>
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<i>> You can scan Gray level and convert</i><br>
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<i>> to bitmap using the Halftone pattern to decide</i><br>
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<i>> what is white and what is black but that defies</i><br>
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<i>> the purpose of the B&W scanning anyway.</i><br>
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<i>> -For Color Correction you should probably know the</i><br>
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<i>> Initial CCT in order to make the correct transformations.</i><br>
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<i>> You can always assume the I (identity matrix) but I don't think</i><br>
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<i>> that holds true for apple scanners at least.</i><br>
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<i>> -For calibration I don't have the manual handy and cannot comment.</i><br>
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<i>></i><br>
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<i>> The question is it worth the trouble?</i><br>
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<i>></i><br>
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<i>> I think it is better to allow the possibility of downloading info to the</i><br>
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<i>> scanner, where it is GAMMA, CCT, calibration or halftone patterns.</i><br>
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<i>></i><br>
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<p>
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Hi Milon,<br>
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<p>
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please reread my mail at first: gamma and halftone tables are needed!<br>
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color correction may be,<br>
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<p>
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but what shall a frontend do with a calibration vector:<br>
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what I know about such calibrations is:<br>
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the scanner does scan a white area and sends calibration data<br>
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to the backend, the backend calculates the calibration vector and<br>
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sends it back to the scanner.<br>
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There is nothing a frontend can do with it, because the calibration<br>
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is done different for each scanner-model and vendor.<br>
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<p>
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Bye<br>
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Oliver<br>
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<p>
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<pre>
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--
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EMAIL: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>
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WWW: <a href="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</a>
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<p>
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<p>
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<p>
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<p>
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<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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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0345.html">Oliver Rauch: "Re: SANE V2 - again..."</a>
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<li> <b>Previous message:</b> <a href="0343.html">abel deuring: "Re: SANE V2 - again..."</a>
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<li> <b>Maybe in reply to:</b> <a href="0327.html">abel deuring: "SANE V2 - again..."</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0345.html">Oliver Rauch: "Re: SANE V2 - again..."</a>
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<!-- reply="end" -->
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</ul>
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