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68 wiersze
2.8 KiB
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<!-- received="Fri May 21 00:39:48 1999 PDT" -->
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<!-- sent="Fri, 21 May 1999 09:45:59 +0200" -->
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<!-- name="Ewald R. de Wit" -->
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<!-- subject="Re: Gamma and xsane" -->
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<title>sane-devel: Re: Gamma and xsane</title>
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<h1>Re: Gamma and xsane</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>Fri, 21 May 1999 09:45:59 +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#220">[ date ]</a><a href="index.html#220">[ thread ]</a><a href="subject.html#220">[ subject ]</a><a href="author.html#220">[ author ]</a>
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<li> <b>Next message:</b> <a href="0221.html">Denis PROST: "only negative output with scanimage (Canon Canoscan 300)"</a>
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<li> <b>Previous message:</b> <a href="0219.html">Patrice Espie: "Any sane-ready scanner with ADF ?"</a>
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</ul>
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Chris Bitmead (<a href="mailto:chris.bitmead@bigfoot.com">chris.bitmead@bigfoot.com</a>) wrote:<br>
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<p>
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<i>> I've read a few things about what Gamma is and I think I understand it,</i><br>
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<i>> but I'm still not clear on what the Gamma Slider does in xsane.</i><br>
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<i>> </i><br>
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<i>> Does the Gamma Slider:</i><br>
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<i>> </i><br>
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<i>> a) Have no effect on the resulting scan file, it merely assists viewing</i><br>
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<i>> on your monitor.</i><br>
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<i>> </i><br>
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<i>> b) Modify the resulting scan file to look pleasant on your monitor (and</i><br>
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<i>> thus render it potentially unpleasant on a different monitor).</i><br>
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<p>
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That is answer b. <br>
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<br>
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<i>> How does it relate to archiving images? Should I leave the gamma alone</i><br>
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<i>> for an archived image and only adjust it for a web image?</i><br>
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<p>
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For both web and archival work a gamma of around 2.2 to 2.5 is<br>
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sensible with a PC type monitor. A gamma of 2.2 is used in most<br>
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contemporary standards. Your images will look too light on Macs as<br>
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they have an effective gamma of 1.8 but that's just the way it is.<br>
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<p>
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If you want to know more about gamma then see<br>
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<a href="http://www.inforamp.net/~poynton/GammaFAQ.html">http://www.inforamp.net/~poynton/GammaFAQ.html</a><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="0221.html">Denis PROST: "only negative output with scanimage (Canon Canoscan 300)"</a>
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<li> <b>Previous message:</b> <a href="0219.html">Patrice Espie: "Any sane-ready scanner with ADF ?"</a>
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<!-- nextthread="start" -->
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</ul>
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