node-imagemagick

A Node.js interface to the ImageMagick command-line tools.

NOTE: This project does not yet support all of ImageMagicks tools. Currently only convert is supported.

Examples

To save a thumbnail of an image:

imagemagick = require('imagemagick');

/* Run the command immediately: */
imagemagick.convert([
    {define: {jpeg:{size:{width:256, height:256}}}},      // `define` definitions are serialised and `geometry` values are parsed.
    {add: 'image.png'},                                   // `add` is a way to add custom arguments, in this case the filename.
    'autoOrient',                                         // options that don't require arguments can be given as a string or object (e.g. `{autoOrient: null}`).
    {fuzz:5},
    'trim',
    {repage: true},                                       // if a Boolean is given as the only argument, then the option functions as a reset (e.g. '+repage').
    'strip',
    {thumbnail: {width:128,height:128,onlyShrink:true}},  // `geometry` object values have a more clear syntax, but you can give a string if you want (e.g. "128x128>").
    {unsharp: 0.5},                                       // `unsharp` accepts either a sigma value or an object as an argument (e.g. `{unsharp: {sigma:6, gain:0.5, threshold:0}}`).
    {add: 'PNG8:image_thumb.png'}
  ],
  function(error, stdout, stderr) {                     // optional callback function.
    console.log("Thumbnail created.");                  // If you prefer events, 'done' and 'run_error' or 'run_success' will be emitted if a callback function isn't given.
  }
);

/* Or create it programmatically: */
var cropImage = true;
var convert = imagemagick.convert()
  .define({jpeg:{size:{width:256, height:256}}})
  .add('image.png'})
  .autoOrient()
;
if (cropImage) {
  convert
    .fuzz(5)
    .trim()
    .repage(true)
  ;
}
convert
  .strip()
  .thumbnail({width:128,height:128,onlyShrink:true})
  .unsharp(0.5)
  .add('PNG8:image_thumb.png')
;
convert.on('run_success', function(stdout) {
    console.log("Thumbnail created.");
});
convert.run();