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2.6 KiB
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<!-- received="Sun Oct 4 07:04:20 1998 PDT" -->
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<!-- sent="Sun, 4 Oct 1998 08:05:37 -0600" -->
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<!-- name="Craig Ruff" -->
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<!-- email="crruff@uswest.net" -->
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<!-- subject="Re: HP photosmart and negatives to positives" -->
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<!-- inreplyto="19980923214419.B1213@mimar.demon.nl" -->
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<title>sane-devel: Re: HP photosmart and negatives to positives</title>
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<h1>Re: HP photosmart and negatives to positives</h1>
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<b>Craig Ruff</b> (<a href="mailto:crruff@uswest.net"><i>crruff@uswest.net</i></a>)<br>
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<i>Sun, 4 Oct 1998 08:05:37 -0600</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#55">[ date ]</a><a href="index.html#55">[ thread ]</a><a href="subject.html#55">[ subject ]</a><a href="author.html#55">[ author ]</a>
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<li> <b>Next message:</b> <a href="0056.html">Dr. Andreas Bolsch: "Re: Mustek 1200 III SP and color registration"</a>
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<li> <b>Previous message:</b> <a href="0054.html">Didier Carlier: "RE: Nikon or Minolta slide scanner?"</a>
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</ul>
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<!-- body="start" -->
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On Wed, Sep 23, 1998 at 09:44:19PM +0200, Chris Niekel wrote:<br>
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<i>> Does anyone know a tool to convert a negative into a positive? I've tried </i><br>
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<i>> a few things with the gimp, but I can't come close to the positives the</i><br>
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<i>> windoze-program delivers.</i><br>
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<p>
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Using gimp will work for color negatives. What you will be doing is<br>
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called orange mask removal. First, scan a fully-exposed portion<br>
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of the negative. For example, the leader at the front of the roll.<br>
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It will be an clear orange color. Take a rectangle and average the<br>
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color values. You may get values like R:240 G:190 B:150. Calculate the<br>
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values you need to add to the color components to get each to match<br>
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the red value. In this case the value for green is 50 and blue is 90.<br>
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<p>
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Scan a negative frame. Use gimp to add the calculated green and blue<br>
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values to the entire scan. Then invert the colors to get a positve.<br>
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You may then use gimp to adjust the contrast and brightness as you like.<br>
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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="0056.html">Dr. Andreas Bolsch: "Re: Mustek 1200 III SP and color registration"</a>
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<li> <b>Previous message:</b> <a href="0054.html">Didier Carlier: "RE: Nikon or Minolta slide scanner?"</a>
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</ul>
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