Effect is generally in mostly vertical with slight horizontal offsets looks like: 
often used by paintors in sky painting like here
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Rella
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it depends on the source image and desired result, i think a description or example'd be very helpful
as i understand it now, the matrix should have similar values in each column and rather big differences between values in rows (maybe every 2 rows) - to make vertical stripes visible among each other
www0z0k
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