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72 wiersze
3.4 KiB
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<!-- received="Sun May 16 19:42:40 1999 PDT" -->
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<!-- sent="Sun, 16 May 1999 21:45:54 -0500" -->
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<!-- name="john allen pitney" -->
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<!-- email="pitney@students.uiuc.edu" -->
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<!-- subject="HP PhotoSmart strip lengths" -->
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<title>sane-devel: HP PhotoSmart strip lengths</title>
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<h1>HP PhotoSmart strip lengths</h1>
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<b>john allen pitney</b> (<a href="mailto:pitney@students.uiuc.edu"><i>pitney@students.uiuc.edu</i></a>)<br>
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<i>Sun, 16 May 1999 21:45:54 -0500</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#152">[ date ]</a><a href="index.html#152">[ thread ]</a><a href="subject.html#152">[ subject ]</a><a href="author.html#152">[ author ]</a>
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<li> <b>Next message:</b> <a href="0153.html">Chris Bitmead: "Re: Film scanners, Canon + Coolscan"</a>
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<li> <b>Previous message:</b> <a href="0151.html">regis rampnoux: "RE: Better Preview? Take xsane-0.25..."</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0157.html">Peter Kirchgessner: "Re: HP PhotoSmart strip lengths"</a>
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<li> <b>Reply:</b> <a href="0157.html">Peter Kirchgessner: "Re: HP PhotoSmart strip lengths"</a>
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<!-- reply="end" -->
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</ul>
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Hi all! <br>
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<p>
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I'm playing with writing a little SANE frontend for my HP PhotoSmart. It's <br>
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not going to be as general as xscanimage or XSane; I only want to duplicate<br>
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the HP frontend (with improvements possibly) using GTK and SANE. <br>
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<p>
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I wonder if anyone doing HP backend development has any leads on getting <br>
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the actual length of a film strip scan from the scanner? The method I've <br>
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found for acquiring a preview scan of a strip of unknown length, is to <br>
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scan the whole thing using the maximum length, buffer everything including <br>
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the spurious bytes at the end, then quit sane and do sane_init again. Now,<br>
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the HP backend reports a maximum scan length which corresponds to the <br>
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actual length of the film strip. Unfortunately, this method has a couple <br>
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of problems: I have to buffer a lot of junk then throw it away later, and <br>
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the sane quit/restart cycle is a little slow. <br>
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<p>
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Is there any way to get the "end of film strip" signal from the scanner <br>
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during the sane_read() loop? <br>
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<p>
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Also, I'm noticing that the image gets stretched in the Y direction for <br>
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any exposure setting which does not have a 100% Red exposure, that is, <br>
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only "Off" and "Negative" seem to have the proper dimensions. I might <br>
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be remembering the effect I saw incorrectly, but I noticed something <br>
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along these lines. <br>
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<p>
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I'm using a Photosmart R032, by the way. <br>
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<p>
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Thanks!<br>
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<p>
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John Pitney<br>
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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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<!-- body="end" -->
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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="0153.html">Chris Bitmead: "Re: Film scanners, Canon + Coolscan"</a>
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<li> <b>Previous message:</b> <a href="0151.html">regis rampnoux: "RE: Better Preview? Take xsane-0.25..."</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0157.html">Peter Kirchgessner: "Re: HP PhotoSmart strip lengths"</a>
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<li> <b>Reply:</b> <a href="0157.html">Peter Kirchgessner: "Re: HP PhotoSmart strip lengths"</a>
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<!-- reply="end" -->
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</ul>
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