function quartet_tile {
for tile in roach eyes
do
- montage ${imgdir}/roach_32/${tile}_${1}.png ${imgdir}/roach_32/${tile}_${2}.png ${imgdir}/roach_32/${tile}_${3}.png ${imgdir}/roach_32/${tile}_${4}.png -geometry -10+0 -background none ${imgdir}/roach_quartet/${tile}_${1}.png
+ montage ${imgdir}/roach_32/${tile}_${1}.png ${imgdir}/roach_32/${tile}_${2}.png ${imgdir}/roach_32/${tile}_${3}.png ${imgdir}/roach_32/${tile}_${4}.png -geometry +0+0 -background none ${imgdir}/roach_quartet/${tile}_${1}.png
done
}