Export multiple sizes from an image

This plugin requires GraphicsMagick and Grunt ~0.4.1

First download and install GraphicsMagick. In Mac OS X, you can simply use Homebrew and do:

brew install graphicsmagick

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 grunt-multiresize --save-dev

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

grunt.loadNpmTasks('grunt-multiresize');

In your project's Gruntfile, add a section named multiresize to the data object passed into grunt.initConfig().

grunt.initConfig({
  multiresize: {
    target: {
      src: 'path/to/source',
      dest: ['path/to/dest1', '/path/to/dest2'],
      destSizes: ['72x72', '114x114']
    }
  },
})

Type: String

The original file to be resized.

Type: String or Array

The files to be written by this script.

Type: Array

The image dimensions expected. The format can be witdhxheight or n%.

Type: String

Background color, default transparent. The format described here.

Type: String

Quality of output image, default 100.

This project was originally created to resize our project icons to conform to CoronaSDK spec. This is our config file.

grunt.initConfig({
  multiresize: {
    iOS: {
      src: 'orig/Icon-512.png',
      dest: ['Icon.png', 'Icon@2x.png', 'Icon-72.png', 'Icon-72@2x.png'],
      destSizes: ['57x57', '114x114', '72x72', '144x144']
    },
    Android: {
      options: {
        background: '#ffffff'
      },
      src: 'orig/Icon-Android-512.png',
      dest: ['Icon-ldpi.png', 'Icon-mdpi.png', 'Icon-hdpi.png', 'Icon-xhdpi.png'],
      destSizes: ['36x36', '48x48', '72x72', '96x96']
    }
  },
})

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.

v0.1.0: Initial release