bash + ImageMagick > rainbow color 상자 만들기 v0.1

코드 v0.1

#!/usr/bin/bash/env

set -eu # just in case

# v0.1 Aug. 07, 2018
#   - draw rainbow colored layered image

WRK1_FILE="wrk1.png"  # work file (arbitrary names)
WRK2_FILE="wrk2.png"  # work file (arbitrary names)
OUT_FILE="out.png"    # output

wrksize=100  # size of the image
incsize=10   # increment size

#------------------------------
#CONFIGURATION
#   colors from innermost to outer
COLS=("violet" "indigo" "blue" "green" "yellow" "orange" "red")
#------------------------------

#1. base image
sizestr=$(echo $wrksize | awk '{print $1"x"$1}')  # e.g. 100x100
convert -size $sizestr xc:${COLS[0]} $WRK1_FILE

#2. expand image
((maxloop=${#COLS[*]}-1))
for idx in $(seq 1 $maxloop)
do
  ((wrksize=wrksize+incsize*2))
  sizestr=$(echo $wrksize | awk '{print $1"x"$1}')  # e.g. 100x100
  echo $sizestr
  convert $WRK1_FILE -page +10+10 -background ${COLS[idx]} \
    -extent $sizestr -flatten $WRK2_FILE
  cp $WRK2_FILE $WRK1_FILE
done

#3. output 
mv $WRK2_FILE $OUT_FILE

#remove temporary files
rm -f $WRK1_FILE

echo "[$OUT_FILE] is produced"

설정

실행

$ bash layered_image_180807_exec 
120x120
140x140
160x160
180x180
200x200
220x220
[out.png] is produced

참고