node-imagemagick

**This version solves the bug of Cannot read property 'split' of undefined when calling identify.

Imagemagick module for Node.

Note: This code has been unmaintained for a long time. Please consider using the gm module instead.

You can install this module using yarn:

yarn add altiimagemagick

Requires imagemagick CLI tools to be installed. There are numerous ways to install them. For instance, if you're on OS X you can use Homebrew: brew install imagemagick.

Example

var im = require('altiimagemagick');
im.readMetadata('kittens.jpg', function(err, metadata){
  if (err) throw err;
  console.log('Shot at '+metadata.exif.dateTimeOriginal);
})
// -> Shot at Tue, 06 Feb 2007 21:13:54 GMT

API

convert.path

Path to the convert program. Defaults to "convert".

identify.path

Path to the identify program. Defaults to "identify".

identify(path, callback(err, features))

Identify file at path and return an object features.

Example:

im.identify('kittens.jpg', function(err, features){
  if (err) throw err;
  console.log(features);
  // { format: 'JPEG', width: 3904, height: 2622, depth: 8 }
});

identify(args, callback(err, output))

Custom identification where args is an array of arguments. The result is returned as a raw string to output.

Example:

im.identify(['-format', '%wx%h', 'kittens.jpg'], function(err, output){
  if (err) throw err;
  console.log('dimension: '+output);
  // dimension: 3904x2622
});

readMetadata(path, callback(err, metadata))

Read metadata (i.e. exif) in path and return an object metadata. Modelled on top of identify.

Example:

im.readMetadata('kittens.jpg', function(err, metadata){
  if (err) throw err;
  console.log('Shot at '+metadata.exif.dateTimeOriginal);
  // -> Shot at Tue, 06 Feb 2007 21:13:54 GMT
});

convert(args, callback(err, stdout, stderr))

Raw interface to convert passing arguments in the array args.

Example:

im.convert(['kittens.jpg', '-resize', '25x120', 'kittens-small.jpg'], 
function(err, stdout){
  if (err) throw err;
  console.log('stdout:', stdout);
});

resize(options, callback(err, stdout, stderr))

Convenience function for resizing an image, modelled on top of convert.

The options argument have the following default values:

{
  srcPath: undefined,
  srcData: null,
  srcFormat: null,
  dstPath: undefined,
  quality: 0.8,
  format: 'jpg',
  progressive: false,
  width: 0,
  height: 0,
  strip: true,
  filter: 'Lagrange',
  sharpening: 0.2,
  customArgs: []
}

srcPath, dstPath and (at least one of) width and height are required. The rest is optional.

Example:

im.resize({
  srcPath: 'kittens.jpg',
  dstPath: 'kittens-small.jpg',
  width:   256
}, function(err, stdout, stderr){
  if (err) throw err;
  console.log('resized kittens.jpg to fit within 256x256px');
});

Example with stdin/stdout:

var fs = require('fs');
im.resize({
  srcData: fs.readFileSync('kittens.jpg', 'binary'),
  width:   256
}, function(err, stdout, stderr){
  if (err) throw err
  fs.writeFileSync('kittens-resized.jpg', stdout, 'binary');
  console.log('resized kittens.jpg to fit within 256x256px')
});

crop(options, callback)

Convenience function for resizing and cropping an image. crop uses the resize method, so options and callback are the same. crop uses options.srcPath, so make sure you set it :) Using only options.width or options.height will create a square dimensioned image. Gravity can also be specified, it defaults to Center. Available gravity options are [NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast]

Example:

im.crop({
  srcPath: path,
  dstPath: 'cropped.jpg',
  width: 800,
  height: 600,
  quality: 1,
  gravity: "North"
}, function(err, stdout, stderr){
  // foo
});