# faint vertical stripes while scanning

Ondrej Popp (ondrej@geocities.com)
Sat, 07 Mar 1998 11:50:40 +0100

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Hi,
I have just discoverd that when I scan under 300 dpi with my
UMAX Astra 1200S I get faint vertical stripes in my image.
Sometimes. Moiree Pattern? First I thought it was due to my long (3.5m)
SCSI cable
but before I hooked my scanner to it I did some tests and did not notice
any difference.
I did not notice the stripes then either so I think I need to try that
out again.
But on the other hand why does it disappear at 300dpi? So before I start
to move the stuff around I thought I might mention this inhere to see if
there woud be someone who knows about this. To remove the stripes I did
a little 'Dolby noise reduction'. Scanning at 300 dpi and scaling the
image in the gimp to 1/3. This removes the stripes effectively.

Ondrej

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