See http://eirikso.com/2010/12/13/i-need-some-image-programming-advice/

eirikmagick.sh

tmpdir=tmp
if [ -d "$tmpdir" ]; then
  rm -rf $tmpdir
fi
mkdir $tmpdir
height=2592
width=10
n=0
for f in *.jpg
do
  offset=$(($n*$width))
  c="$(printf "%05d" $n)"
  echo "Creating slice $tmpdir/$c.png"
  convert -crop ${width}x${height}+${offset}+0 $f $tmpdir/$c.png
  n=$(($n+1))
done

count="$(ls -1 $tmpdir | wc -l)"
echo "Joining $count slices into out.png"
montage $tmpdir/*.png -mode concatenate -tile ${count}x out.png