Whiteboard cleaning command

zshrc.local

# converts an image to png, extracts strokes, traces etc.
whiteboard() {
  convert "$1" "$1.converted.png"
  echo "Converted"
  convert "$1.converted.png" \
    -morphology Convolve DoG:15,100,0 \
    -negate -normalize -blur 0x1 -channel RBG \
    -level 60%,91%,0.1 \
    "$1.cleaned.png"
  echo "Cleaned"
}