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Batch Minify PNG and JPEG images, Ideas come from grunt-contrib-imagemin


Batch Minify PNG and JPEG images, Ideas come from grunt-contrib-imagemin

Note that this is not an official Grunt plugin release! If you want to use this in a project, please be sure to follow the instructions for installing development versions, as outlined in the Installing Grunt guide.

Getting Started

This plugin requires Grunt ~0.4.0

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install imgcompress --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:


Imgcompress task

Run this task with the grunt imgcompress command.

Task targets, files and options may be specified according to the grunt Configuring tasks guide.

Minify images using OptiPNG and jpegtran. ### Options

optimizationLevel (png only)

Type: Number
Default: 0

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. 1 trial
  2. 8 trials
  3. 16 trials
  4. 24 trials
  5. 48 trials
  6. 120 trials
  7. 240 trials

progressive (jpg only)

Type: Boolean
Default: false

Lossless conversion to progressive.


Type: String
Default: override

available override, error

destination file duplication, log an error message if chose error, override exist file and log an override message if chose override


Type: number Default: 30

spawn how many child threads at most to help optimaze image


Type: Boolean Default: true

recurse sub directory


Type: string or array Default: null

ignores these files that match this, files that are not png, jpg or jpeg will be ignored automatic
use grunt.util.match with the options {matchBase: true} #### Example config

grunt.initConfig ({
    imgcompress: {
        options: {
            optimizationLevel: 3
            progressive: true 
            duplication: 'override'
            childs: 30
            recurse: false 
            ignores: ['*.png']
        dist: {
            files: {
                'tmp/bar.jpg': 'imgs/test/test.jpg',
                'tmp': ['imgs/test', 'imgs/test_1']
        dist2: {
            files: [
                { src: 'test', dest: 'tmp' }
grunt.registerTask('default', ['imgcompress:dist']);

Release History

  • 2013-06-29   v0.1.0   Initial release.

Task submitted by ZhongleiQiu

This file was generated on Sat Jun 29 2013 10:29:41.