Dependency installation ( https://www.npmjs.com/package/gulp-imagemin )

$ npm install --save-dev gulp-imagemin

Usage

/*
 * Your other dependencies.
 */

var imagemin = require('gulp-imagemin');

/*
 * `gulp images` - Run lossless compression on all the images.
 */
gulp.task('images', function() {
  return gulp.src(sourcePath) // e.g. /assets/images
    .pipe(imagemin({
      progressive: true,
      interlaced: true,
      svgoPlugins: [{removeUnknownsAndDefaults: false}, {cleanupIDs: false}]
    }))
    .pipe(gulp.dest(buildPath + 'images')); // e.g. /static/dist/
});