sane-project-website/old-archive/1997-11/0174.html

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<!-- name="Gernot Zander" -->
<!-- email="hifi@scorpio.in-berlin.de" -->
<!-- subject="Re: Mustek Bugreport (Gamma didn't work)" -->
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<title>sane-devel: Re: Mustek Bugreport (Gamma didn't work)</title>
<h1>Re: Mustek Bugreport (Gamma didn't work)</h1>
<b>Gernot Zander</b> (<a href="mailto:hifi@scorpio.in-berlin.de"><i>hifi@scorpio.in-berlin.de</i></a>)<br>
<i>Sun, 30 Nov 1997 21:12:21 +0100 (MET)</i>
<p>
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Hi,<br>
<p>
<i>&gt; Looks like your mail is incomplete:</i><br>
<i>&gt; </i><br>
<i>&gt;   Gernot&gt; Hi, I tried sane today and wondered why the setting of gamma</i><br>
<i>&gt;   Gernot&gt; table seemed to be ignored by the scanner (although it</i><br>
<i>&gt;   Gernot&gt; worked with muscan) and after long houres I moved the 4</i><br>
<i>&gt;   Gernot&gt; lines for start_scan() in sane_start() downwards below the</i><br>
<i>&gt;   Gernot&gt; lines for the transmission of the gamma table, so it looks</i><br>
<i>&gt;   Gernot&gt; now:</i><br>
<i>&gt; </i><br>
<p>
There was a . at the begin of the line, maybe this irritated<br>
one MTA.<br>
<p>
<i>&gt; Also, may I suggest to use <a href="mailto:sane-devel@mostang.com?">sane-devel@mostang.com?</a></i><br>
<p>
It affacts the mustek driver only, but I send a copy there...<br>
<p>
Here the mail again complete (without "."):<br>
<p>
I tried sane today and wondered why the setting of gamma table<br>
seemed to be ignored by the scanner (although it worked with muscan)<br>
and after long houres I moved the 4 lines for start_scan()<br>
in sane_start() downwards below the lines for the transmission<br>
of the gamma table, so it looks now:<br>
_.<br>
_. (more gamma_correction())<br>
_.<br>
          status = gamma_correction (s, MUSTEK_CODE_BLUE);<br>
        }<br>
    }<br>
  else<br>
    status = gamma_correction (s, MUSTEK_CODE_GRAY);<br>
<p>
  if (status != SANE_STATUS_GOOD)<br>
    goto stop_scanner_and_return;<br>
/********* start_scan() _after_ gamma has been set *********/<br>
  s-&gt;scanning = SANE_TRUE;<br>
<p>
  status = start_scan (s);<br>
  if (status != SANE_STATUS_GOOD)<br>
    goto stop_scanner_and_return;<br>
<p>
  s-&gt;ld.max_value = 0;<br>
  if (s-&gt;hw-&gt;flags &amp; MUSTEK_FLAG_SINGLE_PASS)<br>
_.<br>
_.<br>
_.<br>
<p>
Now the gamma works. I've seen you have the lines for backtrack_and_adf<br>
twice, one above and one below the start_scan(). Maybe the same<br>
should be done with the gamma correction too, but I only have the<br>
600CX and don't know if other models require this after start_scan().<br>
<p>
I noticed a second problem: It depends of the position of<br>
custom-gamma[=yes] in the command line if the values for x and y<br>
are honored or not, if I give:<br>
<p>
scanimage -d net:localhost:mustek:/dev/scanner --mode gray -t 11 -l 30<br>
-x 150 -y 105 --custom-gamma --gamma-table=[0]0-[10]32-[64]128-[255]255<br>
--resolution 150 &gt; delme.pnm<br>
<p>
they are ignored (!), and a full page (from -t and -l) is scanned,<br>
<p>
if I do:<br>
scanimage -d net:localhost:mustek:/dev/scanner --mode gray -t 11 -l 30<br>
--custom-gamma -x 150 -y 105 --gamma-table=[0]0-[10]32-[64]128-[255]255<br>
--resolution 150 &gt; delme.pnm<br>
then it works fine.<br>
But I didn't found the reason for that.<br>
<p>
Version:<br>
lake:~# scanimage -V<br>
scanimage (sane) 0.67<br>
<p>
mfg.<br>
Gernot<br>
<p>
<pre>
-- 
&lt;<a href="mailto:hifi@scorpio.in-berlin.de">hifi@scorpio.in-berlin.de</a>&gt; (Gernot Zander)
Um Rekursion zu verstehen, mu<6D> man entweder einen kennen, der
sie versteht, oder sie schon verstanden haben. (M. Freericks)
<p>
<pre>
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</pre>
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