sample grunt configuration for image minification

image-min-grunt.js

// Project configuration.
grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

	imagemin: {
		skinpng: {
			options: {
				progressive: 6
			},
			files: [{
				expand: true,
				cwd: Config.assetsRoot + 'images/',
				src: ['**/*.png'],
				dest: Config.assetsRoot + 'images/',
				ext: '.png'
			}]
		},
		skinjpg: {
			options: {
				progressive: true
			},
			files: [{
				expand: true,
				cwd: Config.assetsRoot + 'images/',
				src: ['**/*.jpg'],
				dest: Config.assetsRoot + 'images/',
				ext: '.jpg'
			}]
		},
		wysiwygpng: {
			options: {
				progressive: 6
			},
			files: [{
				expand: true,
				cwd: 'media/wysiwyg/',
				src: ['**/*.png'],
				dest: 'media/wysiwyg/',
				ext: '.png'
			}]
		},
		wysiwygjpg: {
			options: {
				progressive: true
			},
			files: [{
				expand: true,
				cwd: 'media/wysiwyg/',
				src: ['**/*.jpg'],
				dest: 'media/wysiwyg/',
				ext: '.jpg'
			}]
		}
	}
});