convertc2(){
  convert $1 -crop $2 "two.png"
}


converto3(){


  Delimeter="placeHolder"

  if [[ $2 == *"x"* ]]; then
    Delimeter="x"
  else
    Delimeter="X"
  fi

  First="${2%$Delimeter*}"
  Fourth="${2##*+}"
  Lhs="${2%%+*}"
  Rhs="${2#"$Lhs+"}"

  Second="${Lhs##*$Delimeter}"
  Third="${Rhs%+*}"

  One=$(echo "scale=0 ; $First * 1.5" | bc)
  One=${One%.*}
  Two=$(echo "$Second * 1.5" | bc)
  Two=${Two%.*}
  Three=$(echo "$Third * 1.5" | bc)
  Three=${Three%.*}
  Four=$(echo "$Fourth * 1.5" | bc)
  Four=${Four%.*}

  Final=$One"X"$Two"+"$Three"+"$Four

  echo $Final

  convert $1 -crop $Final "three.png"
}

convertc2 /Users/dengjiangzhou/Desktop/Simulator Screen Shot - iPhone 8 - 2019-02-20 at 14.39.02.png   300X300+0+0

converto3 /Users/dengjiangzhou/Desktop/Simulator Screen Shot - iPhone 8 - 2019-02-20 at 14.39.02.png    300X300+0+0

Delimeter="placeHolder"

if [[ $2 == *"x"* ]]; then
    Delimeter="x"
else
    Delimeter="X"
fi

convert $1 -crop $2 "two.png"

convert "$1" -crop "$2" "two.png"

Final=$One"X"$Two"+"$Three"+"$Four

Final="${One}X$Two+$Three+$Four"

width=${spec%%[xX]*}

width=$(bc <<< "$width * 1.5")

((width = width * 3 / 2))