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<title>sane-devel: faint vertical stripes while scanning</title>
<h1>faint vertical stripes while scanning</h1>
<b>Ondrej Popp</b> (<a href="mailto:ondrej@geocities.com"><i>ondrej@geocities.com</i></a>)<br>
<i>Sat, 07 Mar 1998 11:50:40 +0100</i>
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Hi,<br>
I have just discoverd that when I scan under 300 dpi with my<br>
UMAX Astra 1200S I get faint vertical stripes in my image. <br>
Sometimes. Moiree Pattern? First I thought it was due to my long (3.5m)<br>
SCSI cable<br>
but before I hooked my scanner to it I did some tests and did not notice<br>
any difference.<br>
I did not notice the stripes then either so I think I need to try that<br>
out again.<br>
But on the other hand why does it disappear at 300dpi? So before I start<br>
to move the stuff around I thought I might mention this inhere to see if <br>
there woud be someone who knows about this. To remove the stripes I did<br>
a little 'Dolby noise reduction'. Scanning at 300 dpi and scaling the<br>
image in the gimp to 1/3. This removes the stripes effectively.<br>
<p>
Ondrej<br>
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