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<!-- received="Thu Jul 29 01:35:34 1999 PDT" -->
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<!-- sent="Thu, 29 Jul 1999 10:52:25 +0200" -->
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<!-- name="Didier Carlier" -->
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<!-- email="Didier.Carlier@sema.be" -->
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<!-- subject="Re: SANE & exposure times" -->
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<!-- id="199907290852.KAA24165@fritz.sema.be" -->
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<!-- inreplyto="SANE & exposure times" -->
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<title>sane-devel: Re: SANE & exposure times</title>
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<h1>Re: SANE & exposure times</h1>
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<b>Didier Carlier</b> (<a href="mailto:Didier.Carlier@sema.be"><i>Didier.Carlier@sema.be</i></a>)<br>
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<i>Thu, 29 Jul 1999 10:52:25 +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#211">[ date ]</a><a href="index.html#211">[ thread ]</a><a href="subject.html#211">[ subject ]</a><a href="author.html#211">[ author ]</a>
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<li> <b>Next message:</b> <a href="0212.html">Andreas Rick: "Re: SANE & exposure times"</a>
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<li> <b>Previous message:</b> <a href="0210.html">Andreas Rick: "Re: SANE & exposure times"</a>
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<li> <b>Maybe in reply to:</b> <a href="0208.html">Ewald R. de Wit: "SANE & exposure times"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0214.html">Ewald R. de Wit: "Re: SANE & exposure times"</a>
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<li> <b>Next in thread:</b> <a href="0212.html">Andreas Rick: "Re: SANE & exposure times"</a>
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<li> <b>Reply:</b> <a href="0214.html">Ewald R. de Wit: "Re: SANE & exposure times"</a>
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<a href="mailto:ewald@pobox.com">ewald@pobox.com</a> said:<br>
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<i>> My concern is not changing the values but getting them from the</i><br>
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<i>> backend so the frontend knows how to make sense out of the RGB values.</i><br>
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<i>> I think we could use SANE_NAME_SCAN_EXPOS_TIME_R (defined in sane/</i><br>
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<i>> saneopts.h) and friends for that. That is, the frontend should check</i><br>
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<i>> these options and if they are present then it should divide the RGB</i><br>
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<i>> values by their corresponding exposure time.</i><br>
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<p>
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What is the meaning of an RGB value divided by a time ? Nothing says <br>
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for instance that the sensitivity of the detectors is the same for all<br>
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colors so that even for a picture that looks perfectly grey, you would get <br>
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completely different values for the quotients.<br>
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<p>
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I'm just curious to understand in what application that division makes sense.<br>
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<p>
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Best regards,<br>
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Didier<br>
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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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</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="0212.html">Andreas Rick: "Re: SANE & exposure times"</a>
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<li> <b>Previous message:</b> <a href="0210.html">Andreas Rick: "Re: SANE & exposure times"</a>
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<li> <b>Maybe in reply to:</b> <a href="0208.html">Ewald R. de Wit: "SANE & exposure times"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0214.html">Ewald R. de Wit: "Re: SANE & exposure times"</a>
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<li> <b>Next in thread:</b> <a href="0212.html">Andreas Rick: "Re: SANE & exposure times"</a>
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<li> <b>Reply:</b> <a href="0214.html">Ewald R. de Wit: "Re: SANE & exposure times"</a>
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<!-- reply="end" -->
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</ul>
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