kopia lustrzana https://gitlab.com/sane-project/website
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4.2 KiB
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95 wiersze
4.2 KiB
HTML
<!-- received="Fri Nov 26 08:07:11 1999 PST" -->
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<!-- sent="Fri, 26 Nov 1999 17:11:07 +0100" -->
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<!-- name="Manuel Panea" -->
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<!-- email="mpd@rzg.mpg.de" -->
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<!-- subject="How do I get a negative orange mask *back*?" -->
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<!-- inreplyto="383C6A45.6E962DCF@wolfsburg.de" -->
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<title>sane-devel: How do I get a negative orange mask *back*?</title>
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<h1>How do I get a negative orange mask *back*?</h1>
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<b>Manuel Panea</b> (<a href="mailto:mpd@rzg.mpg.de"><i>mpd@rzg.mpg.de</i></a>)<br>
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<i>Fri, 26 Nov 1999 17:11:07 +0100</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#258">[ date ]</a><a href="index.html#258">[ thread ]</a><a href="subject.html#258">[ subject ]</a><a href="author.html#258">[ author ]</a>
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<li> <b>Next message:</b> <a href="0259.html">Kevin Charter: "Re: no SG__BIG_BUF in kernel 2.2.12"</a>
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<li> <b>Previous message:</b> <a href="0257.html">joakim verona: "Re: no SG__BIG_BUF in kernel 2.2.12"</a>
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-----BEGIN PGP SIGNED MESSAGE-----<br>
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<p>
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<p>
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Hi. Here is a question to the experts.<br>
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<p>
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I'm developing the Canon backend. The backend works with some Canon<br>
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flatbed scanner models and with my 35mm-film scanner model 2700F. This<br>
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model can scan negatives and slides.<br>
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<p>
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When scanning negatives, there is a SCSI command to set the scanning<br>
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speed. In this way, dark photos can be scanned at a lower speed, exposing<br>
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the film to more light so that the scanned image looks good. Alas, this<br>
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speed setting command works only for negatives, not for slides (that's<br>
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what the specs say and it's true, I've tried it). Unfortunately, the only<br>
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available and fixed scanning speed for slides is invariably too fast.<br>
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Almost all slides get scanned too dark. What to do?<br>
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<p>
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I thought I could try to outsmart the scanner and tell it to scan a<br>
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negative at a low speed when in fact I am feeding it a slide. Inverting<br>
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the colors is then an easy problem. The difficult problem is that, when<br>
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scanning negatives, the scanner automatically removes the orange color of<br>
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negative films. Slide films do not have this orange color, so if I try<br>
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this trick, the scanner gives me an image where all information about<br>
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orange-like colors is missing.<br>
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<p>
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Does anyone know of a good way to get this orange back? Just "adding" it<br>
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with e.g. the Gimp doesn't help, the image still doesn't look good. With<br>
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some other operations, specially "equalize" I can get the image to look<br>
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almost good, but not quite, and worst of all, the histogram is then "full<br>
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of holes".<br>
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<p>
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I have put on my Web-page a sample image scanned as a negative and as a<br>
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slide, in case someone wants to see the effects and maybe experiment with<br>
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the images. Find them at: <a href="http://www.rzg.mpg.de/~mpd/sane/blueslides">http://www.rzg.mpg.de/~mpd/sane/blueslides</a><br>
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<p>
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Any help would be very much appreciated.<br>
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<p>
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Manuel Panea Tel. +49 89 3299 1133<br>
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Rechenzentrum Garching Fax +49 89 3299 1301<br>
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Postfach 1533 E-mail: <a href="mailto:mpd@rzg.mpg.de">mpd@rzg.mpg.de</a><br>
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85740 Garching Germany <a href="http://www.rzg.mpg.de/~mpd">http://www.rzg.mpg.de/~mpd</a><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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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</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="0259.html">Kevin Charter: "Re: no SG__BIG_BUF in kernel 2.2.12"</a>
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<li> <b>Previous message:</b> <a href="0257.html">joakim verona: "Re: no SG__BIG_BUF in kernel 2.2.12"</a>
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