kopia lustrzana https://gitlab.com/sane-project/website
75 wiersze
4.3 KiB
HTML
75 wiersze
4.3 KiB
HTML
<!-- received="Thu Mar 25 21:43:37 1999 PST" -->
|
|
<!-- sent="Thu, 25 Mar 1999 21:43:05 -0800" -->
|
|
<!-- name="Dean Martin Townsley" -->
|
|
<!-- email="townsley@physics.ucsb.edu" -->
|
|
<!-- subject="Re: Calibration problem on UMAX Astra 1220S" -->
|
|
<!-- id="199903260542.VAA09109@spacecase.physics.ucsb.edu" -->
|
|
<!-- inreplyto="199903260214.SAA05950@spacecase.physics.ucsb.edu" -->
|
|
<title>sane-devel: Re: Calibration problem on UMAX Astra 1220S</title>
|
|
<h1>Re: Calibration problem on UMAX Astra 1220S</h1>
|
|
<b>Dean Martin Townsley</b> (<a href="mailto:townsley@physics.ucsb.edu"><i>townsley@physics.ucsb.edu</i></a>)<br>
|
|
<i>Thu, 25 Mar 1999 21:43:05 -0800</i>
|
|
<p>
|
|
<ul>
|
|
<li> <b>Messages sorted by:</b> <a href="date.html#234">[ date ]</a><a href="index.html#234">[ thread ]</a><a href="subject.html#234">[ subject ]</a><a href="author.html#234">[ author ]</a>
|
|
<!-- next="start" -->
|
|
<li> <b>Next message:</b> <a href="0235.html">Martin Wagner: "Re: SANE 1.00 + Mustek SE6000SP"</a>
|
|
<li> <b>Previous message:</b> <a href="0233.html">Henning Meier-Geinitz: "Re: xsane-0.18 available"</a>
|
|
<li> <b>In reply to:</b> <a href="0232.html">Dean Martin Townsley: "Re: Calibration problem on UMAX Astra 1220S"</a>
|
|
<!-- nextthread="start" -->
|
|
<!-- reply="end" -->
|
|
</ul>
|
|
<!-- body="start" -->
|
|
<i>> > > My problem with the calibration is simple: I can't get it to perform the</i><br>
|
|
<i>> > > calibration. I'm using sane 1.00 with the build-1 patch for the umax drivers</i><br>
|
|
<i>> </i><br>
|
|
[snip]<br>
|
|
<i>> this appears abnormal, even for stuff on white backgrounds. I am under the</i><br>
|
|
<i>> ipression that this is what the "Quality Calibration" is for (though I could</i><br>
|
|
<i>> be wrong) is to set the white point so that it is not out of the scanner's</i><br>
|
|
<i>> sensing range, as it apparently is on mine since white and off-white come up</i><br>
|
|
<i>> as the same color -- ffffff white. I would assume it's just an impossible</i><br>
|
|
<p>
|
|
Ok, well after some time perusing the source and looking at the UMAX docs I<br>
|
|
find I have convinced myself that "Quality Calibration" is not necessarily<br>
|
|
for adjustment of white point. There is other calibration stuff, such as<br>
|
|
that done by the driver, and the kind with the different modes. But from<br>
|
|
looking at the docs this option sets the quality bit in the scan command<br>
|
|
block which chooses between "do quality calibration" and "do speed<br>
|
|
calibration".<br>
|
|
From my trials setting or not setting this bit seems to have very little<br>
|
|
effect on the scan. So this leads to two questions: What does the quality<br>
|
|
calibration bit actually do? If it is something other than setting the white<br>
|
|
level, the popup help should probably be changed because that's what it says<br>
|
|
this is for. Or maybe it's accurate and my scanner just does a bad job of<br>
|
|
it. (which may be why they changed it to driver calibration in the later<br>
|
|
firmware versions.) The second question is: Does anyone know another method<br>
|
|
of fixing my problem? The problem being basically that white is offscale, and<br>
|
|
thus anything near white saturates to white. Any advice would be<br>
|
|
appreciated. From looking over the docs and the info reported by the driver,<br>
|
|
it appears that the 1220S does not support calibration, lamp adjustment, or<br>
|
|
anything of the sort. Let me know if I'm wrong on this. At this point I'm<br>
|
|
basically accepting that this all is why I didn't pay very much for this<br>
|
|
scanner, and I'll just be happy with it's performance on photographs and<br>
|
|
such.<br>
|
|
Well, sorry to be so long-winded about this, but thanks for bearing with my<br>
|
|
little battle with this scanner and thanks for the great software.<br>
|
|
Later,<br>
|
|
-Dean Townsley<br>
|
|
<p>
|
|
<pre>
|
|
--
|
|
Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
|
|
To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a>
|
|
</pre>
|
|
<!-- body="end" -->
|
|
<p>
|
|
<ul>
|
|
<!-- next="start" -->
|
|
<li> <b>Next message:</b> <a href="0235.html">Martin Wagner: "Re: SANE 1.00 + Mustek SE6000SP"</a>
|
|
<li> <b>Previous message:</b> <a href="0233.html">Henning Meier-Geinitz: "Re: xsane-0.18 available"</a>
|
|
<li> <b>In reply to:</b> <a href="0232.html">Dean Martin Townsley: "Re: Calibration problem on UMAX Astra 1220S"</a>
|
|
<!-- nextthread="start" -->
|
|
<!-- reply="end" -->
|
|
</ul>
|