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66 wiersze
3.1 KiB
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<!-- received="Tue Aug 31 01:01:42 1999 PDT" -->
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<!-- sent="Tue, 31 Aug 1999 10:02:24 +0200" -->
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<!-- name="Ewald R. de Wit" -->
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<!-- subject="Re: SANE V2 - again..." -->
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<!-- inreplyto="37CACDFA.5093AC10@satzbau-gmbh.de" -->
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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>Ewald R. de Wit</b> (<a href="mailto:ewald@pobox.com"><i>ewald@pobox.com</i></a>)<br>
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<i>Tue, 31 Aug 1999 10:02:24 +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#361">[ date ]</a><a href="index.html#361">[ thread ]</a><a href="subject.html#361">[ subject ]</a><a href="author.html#361">[ author ]</a>
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<li> <b>Next message:</b> <a href="0362.html">Dan Kegel: "Re: Newbie Q: Accessing Scanport SQ4800 via SANE"</a>
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<li> <b>Previous message:</b> <a href="0360.html">Tom Martone: "Re: SANE V2 - again..."</a>
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</ul>
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abel deuring (<a href="mailto:a.deuring@satzbau-gmbh.de">a.deuring@satzbau-gmbh.de</a>) wrote:<br>
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<p>
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<i>> I would like to extend the topic of colour correction: Having a quite</i><br>
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<i>> simple option for a linear transformation is of course fine in many</i><br>
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<i>> situations, but it is not enough for high quality scans. [OK, the</i><br>
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<i>> following mixes the topics of colour correction and calibration...] Look</i><br>
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<i>> for example into some documents of the ICC</i><br>
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<i>> (<a href="http://www.color.org/profiles.html">http://www.color.org/profiles.html</a> or</i><br>
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<i>> <a href="http://www.color.org/iccprofiles.html">http://www.color.org/iccprofiles.html</a>): The ICC profiles allow for</i><br>
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<i>> non-linear transformations in order to achieve better quality. A quite</i><br>
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<i>> complicated but perhaps useful approach to use ICC profiles within Sane</i><br>
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<i>> qould be a transformation </i><br>
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<i>> </i><br>
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<i>> raw</i><br>
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<i>> scan -----------------> CIELab ------------------------> output</i><br>
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<i>> data mapped using data mapped using an data</i><br>
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<i>> an ICC profile ICC profile for </i><br>
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<i>> for the scanner CRT tubes </i><br>
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<i>> (or whatever)</i><br>
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<p>
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Nearly all scanners use CCD or CMOS sensors which are inherently linear<br>
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devices so there would be no practical need for doing non-linear color<br>
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transforms. A 3x3 matrix followed by a tonemap would be good enough.<br>
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<p>
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<pre>
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--
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-- Ewald
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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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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0362.html">Dan Kegel: "Re: Newbie Q: Accessing Scanport SQ4800 via SANE"</a>
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<li> <b>Previous message:</b> <a href="0360.html">Tom Martone: "Re: SANE V2 - again..."</a>
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<!-- nextthread="start" -->
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</ul>
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