Awesome

grunt-contrib-imagemin

Minify images using imagemin

Install

npm install --save-dev grunt-contrib-imagemin

Usage

const mozjpeg = require('imagemin-mozjpeg');

grunt.initConfig({
    imagemin: {
        static: {
            options: {
                optimizationLevel: 3,
                svgoPlugins: [{removeViewBox: false}],
                use: [mozjpeg()] // Example plugin usage
            },
            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-contrib-imagemin');
grunt.registerTask('default', ['imagemin']);

Options

optimizationLevel (png)

Type: number
Default: 3

Select optimization level between 0 and 7.

The optimization level 0 enables a set of optimization operations that require minimal effort. There will be no changes to image attributes like bit depth or color type, and no recompression of existing IDAT datastreams. The optimization level 1 enables a single IDAT compression trial. The trial chosen is what OptiPNG thinks it’s probably the most effective. The optimization levels 2 and higher enable multiple IDAT compression trials; the higher the level, the more trials.

Level and trials:

1 trial
8 trials
16 trials
24 trials
48 trials
120 trials
240 trials

progressive (jpg)

Type: boolean
Default: true

Lossless conversion to progressive.

interlaced (gif)

Type: boolean
Default: true

Interlace gif for progressive rendering.

svgoPlugins (svg)

Type: Array

Customize which SVGO plugins to use. More here.

use

Type: Array
Default: [imagemin.gifsicle(), imagemin.jpegtran(), imagemin.optipng(), imagemin.svgo()]

Plugins to use with imagemin. It comes bundled with the following lossless optimizers:

gifsicle — Compress GIF images
jpegtran — Compress JPEG images
optipng — Compress PNG images
svgo — Compress SVG images

These are bundled for convenience and most users will not need anything else.

concurrency

Type: number
Default: os.cpus().length

Control the maximum number of image optimizations that may be performed in parallel.