Optimizing images with imagemin

1. Install imagemin and its related plugins globally:

   npm install -g imagemin

   npm install -g imagemin-mozjpeg

   npm install -g imagemin-pngquant

   npm install -g imagemin-webp

   npm -g install imagemin-cli

2. Run imagemin with relevant plugin:

   imagemin ~/Dropbox/buzz-logo-round.png  --out-dir=build --plugin=pngquant

Can you tell which image below is optimized:

The one above is 207Kb in size. It is a Jpeg. The one below is 78Kb in size, after running imagemin-mozjpeg on it. I cannot tell the difference.