Make n x m: create an n x m stripe of an image (Linux version)

make-nxm.sh

#! /bin/bash

# LINUX convert \( aa.png aa.png aa.png aa.png aa.png  +append \)  \( aa.png aa.png aa.png aa.png aa.png +append \) -append -gaussian-blur 0.5x0.5 x.png

# call make-nxm <image-filename> rows columms [postfilter-command]

if [ $# -lt 3 ] ; then

 echo
 echo "Create a composed n x m image from a single image"
 echo
 echo "Usage:    make-nxm image-filename rows colums [postfilter-command]"
 echo "          default postfilter: -gaussian-blur 0.5x0.5"
 echo
 echo "Examples: make-nxm img.png 2 4"
 echo "          make-nxm img.png 2 4 -gaussian-blur 0.5x0.5"
 echo
 echo "          create output image 2x4_img.png"
 echo "          composed of 2 rows and 4 columns of img.png"
 echo "          with gaussian blur filter 0.5x0.5 (default filter)"
 echo

 exit

fi

if [ $# -gt 3 ] ; then

  POSTFILTER="$4 $5 $6 $7 $8"

else

  POSTFILTER="-gaussian-blur 0.5x0.5"

fi

FILENAME=$1
COLUMNS=$2
ROWS=$3

y=""
row=1; while [ $row -le $ROWS ]; do y="$y $FILENAME "; row=$[$row+1]; done
col=1; while [ $col -le $COLUMNS ]; do z="$z ( $y +append ) "; col=$[$col+1]; done

convert $z -append $POSTFILTER ${COLUMNS}x${ROWS}_${FILENAME}