script to convert all images in a directory to webp, on mac osx

convert images to webp

// Install webp via Brew
brew install webp

cwebp [-preset <...>] [options] in_file [-o out_file]
  options:
    -o outfile
    -q <float> quality 0-100
    -alpha_q <int> transparency compression 0-100
    -preset <string> default, photo, picture, drawing, icon, text
      -preset must come first
    -m compression (0=fast, 6=slow), default=4
    -size <int> target size (in bytes)

// Convert jpg to webp
for F in *.jpg; do cwebp -q 51 -m 5 $F -o `basename ${F%.jpg}`.webp; done

// Convert png to webp
for F in *.png; do cwebp $F -o `basename ${F%.png}`.webp; done