grunt-image

About

Optimize PNG, JPEG, GIF images with command line.

This is unstable now .

Usage

This is gruntfile.js sample similar to grunt-contrib-imagemin one.

module.exports = function (grunt) {
  grunt.initConfig({
    image: {
      static: {
        options: {
          qualityRange: '80-100',
          optimizationLevel: 3
        },
        files: { 
          'dist/img.png': 'src/img.png',
          'dist/img.jpg': 'src/img.jpg',
          'dist/img.gif': 'src/img.gif'
        }
      },
      dynamic: {
        files: [{
          expand: true,
          cwd: 'src/', 
          src: ['**/*.{png,jpg,gif}'],
          dest: 'dist/'
        }]
      }
    }
  });
    
  grunt.loadNpmTasks('grunt-image');
};

png

pngquant

--quality      min-max don't save below min, use less colors below max (0-100)

Execute ./node_modules/pngquant-bin/vendor/pngquant -h to see more details.

optipng

-fix           enable error recovery
-oN

Execute ./node_modules/optipng-bin/vendor/optipng -h to see more details.

advpng

✔ https://github.com/colorhook/node-advpng

--shrink-normal   Compress normal (7z)

Execute ./node_modules/node-advpng/bin/advpng -h to see more details.

pngcrush

-rem chunkname (or "alla" or "allb")
-brute (use brute-force: try 148 different methods)
-reduce (do lossless color-type or bit-depth reduction)

Execute ./node_modules/pngcrush-bin/vendor/pngcrush -h to see more details.

jpg

jpegtran

-optimize      Optimize Huffman table (smaller file, but slow compression)
-progressive   Create progressive JPEG file

Execute ./node_modules/jpegtran-bin/vendor/jpegtran -h to see more details.

gif

gifsicle

✔ https://github.com/yeoman/node-gifsicle

Using options

-i, --interlace               Turn on interlacing.
-O, --optimize[=LEVEL]        Optimize output GIFs.
--careful                     Write larger GIFs that avoid bugs in other programs.

Execute ./node_modules/gifsicle/vendor/gifsicle -h to see more details.

License

MIT.

hernan/grunt-image