sane-project-website/old-archive/1999-03/0158.html

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<title>sane-devel: HP Photosmart R032 problem</title>
<h1>HP Photosmart R032 problem</h1>
<b>john allen pitney</b> (<a href="mailto:pitney@students.uiuc.edu"><i>pitney@students.uiuc.edu</i></a>)<br>
<i>Tue, 16 Mar 1999 08:34:10 -0600</i>
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Hi again,<br>
<p>
I checked again last night on the behavior of my Photosmart R032 under <br>
xscanimage.  After deleting my .sane/ to make sure there's nothing odd <br>
in there, here's what I did (and observed):<br>
<p>
$ xscanimage [program starts, I choose /dev/scanner]<br>
Preview Window [window appears]<br>
[feed slide to PS, PS pulls in the slide a few mm]<br>
Acquire Preview [preview acquired as slide feeds *into* the PS]<br>
[preview looks okay, needs a lot of gamma correction 1.0 -&gt; 2.2 or so]<br>
[slide is now *inside* the scanner]<br>
Scan [image is acquired as slide is pushed back *out* of the scanner]<br>
[so far, so good]<br>
Acquire Preview [again]<br>
[this time, the preview is acquired and the slide returns to its <br>
 *out* position, unlike the first time]<br>
Scan [this time, the slide feeds slowly back into the scanner, then <br>
immediately reverses direction, and *then* data is acquired.  Also, I <br>
believe this is where the few mm of slip occurs.]<br>
<p>
Also, my test slide is a fairly typical scene, albeit without any sky <br>
showing.  I find that the default straight gamma curve results in a very <br>
dark image--to fix it with gimp's levels tool, I need to set the white <br>
point to 153 (out of 255) and the gamma to about 2.50.  Of course, the <br>
image gets reduced to something like 5 bits of precision after that kind <br>
of rough treatment.  Does this mean the R032 is going to require a <br>
downloaded tone map just to produce a decent image?<br>
<p>
Last night, I tried looking at a log file produced by VueSmart.  I put <br>
some up at the following URLs:<br>
<p>
 <a href="http://www.students.uiuc.edu/~pitney/vuesmart1.log">http://www.students.uiuc.edu/~pitney/vuesmart1.log</a><br>
 <a href="http://www.students.uiuc.edu/~pitney/vuesmart2.log">http://www.students.uiuc.edu/~pitney/vuesmart2.log</a><br>
 <a href="http://www.students.uiuc.edu/~pitney/vuesmart3.log">http://www.students.uiuc.edu/~pitney/vuesmart3.log</a><br>
<p>
The first scan is of a slide using Kodak Ektachrome correction and 4x <br>
scan speed (I think this means 2400/4 dpi).  The second scan is at 2x <br>
speed with the same correction.  The third is at 2x but with a Kodak<br>
Kodachrome color correction.<br>
<p>
I wasn't able to find some of the SCL codes in my SCL guide, *s10323R <br>
for instance.  <br>
<p>
Hope this helps (or interests someone besides me).  <br>
<p>
John Pitney<br>
<p>
<p>
<pre>
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