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<!-- received="Mon Jan 4 20:04:37 1999 PST" -->
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<!-- sent="Mon, 4 Jan 1999 23:04:40 -0500 (EST)" -->
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<!-- name="Chris Pinkham" -->
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<!-- email="cpinkham@infi.net" -->
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<!-- subject="Re: TWAIN - SANE interface : announce" -->
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<!-- id="199901050404.XAA01476@panther.panther.net" -->
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<!-- inreplyto="Pine.LNX.3.96.990104181731.26629A-100000@chef.ecs.soton.ac.uk" -->
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<title>sane-devel: Re: TWAIN - SANE interface : announce</title>
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<h1>Re: TWAIN - SANE interface : announce</h1>
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<b>Chris Pinkham</b> (<a href="mailto:cpinkham@infi.net"><i>cpinkham@infi.net</i></a>)<br>
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<i>Mon, 4 Jan 1999 23:04:40 -0500 (EST)</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#72">[ date ]</a><a href="index.html#72">[ thread ]</a><a href="subject.html#72">[ subject ]</a><a href="author.html#72">[ author ]</a>
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<li> <b>Next message:</b> <a href="0073.html">Andre Couture: "Re: TWAIN - SANE interface : announce"</a>
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<li> <b>Previous message:</b> <a href="0071.html">Oliver Rauch: "Re: Compilation problems"</a>
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</ul>
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<i>> > I got it, but having problmes with the artec backend.</i><br>
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<i>> > </i><br>
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<i>> > It seem that the BRIGHTNESS and some other options are not always supported</i><br>
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<i>> > by some backends.</i><br>
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<i>> </i><br>
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<i>> If the artec backend reports an option "BRIGHTNESS", but when you set it,</i><br>
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<i>> falls over or does something stupid, then it is broken. If the TWAIN</i><br>
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<p>
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As the author of the Artec backend awakens from his holiday slumber......<br>
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<p>
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The low-end models of the Artec scanners do not support brightness in<br>
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hardware. There is a brightness option, but it is defined as being<br>
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INACTIVE (visible by doing a scanimage -h). From looking at other<br>
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backends, it looks like when an option is inactive, the backends do the<br>
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same thing the Artec backend does if you try to set that option with<br>
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sane_control_option(), they return SANE_STATUS_INVAL. I have downloaded<br>
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the winsane frontend but don't have Windows installed anywhere here at my<br>
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house in order to test it. Guess that old 486 might get used after all. :-)<br>
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I don't know if this is why the program was messing up for Andre, but<br>
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it may be the frontend does not handle SANE_STATUS_INVAL.<br>
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<p>
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For the low-end Artec scanners (which I happen to have one of) I'm going<br>
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to have to do the brightness in software according to the docs. The<br>
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high-end Artec models support brightness in hardware, but I have not yet<br>
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implemented it (actually I think they support brightness per RGB channel).<br>
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<p>
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Chris<br>
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<p>
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*****************************************************************************<br>
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** Chris Pinkham Linux v2.2.0-pre3, Sane v1.00, GIMP v1.0 **<br>
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** <a href="mailto:cpinkham@sh001.infi.net">cpinkham@sh001.infi.net</a> <a href="http://www4.infi.net/~cpinkham/">http://www4.infi.net/~cpinkham/</a> **<br>
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*****************************************************************************<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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<!-- 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="0073.html">Andre Couture: "Re: TWAIN - SANE interface : announce"</a>
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<li> <b>Previous message:</b> <a href="0071.html">Oliver Rauch: "Re: Compilation problems"</a>
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<!-- nextthread="start" -->
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</ul>
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