zyn-imagemagick

node-imagemagick

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 npm:

npm install zyn-imagemagick

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 zyn-imagemagick.

Example

var im = require('zyn-imagemagick');
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);
});

Auto rotate support

var options = {
    srcPath: "your input image file",
    dstPath: "your output image file"
}
 
im.EXIFAutoRotate(options, 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: null,
    srcData: null,
    srcFormat: null,
    dstPath: null,
    quality: 0.8,
    format: 'jpg',
    progressive: false,
    colorspace: null,
    width: 0,
    height: 0,
    percent: 0, 
    area_total_pixels: 0, 
    resize_operation: 0,
    strip: true,
    filter: 'Lagrange',
    sharpening: 0.2,
    customArgs: [],
    timeout: 0
}

resize_operation have the below operations. Please see this for detail: http://www.imagemagick.org/Usage/resize/#liquid-rescale

Serial No.	operation	documentation
0	standard operation	convert dragon.gif -resize 64x64 resize_dragon.gif
1	Ignore Aspect Ratio	convert dragon.gif -resize 64x64\! exact_dragon.gif
2	Only Shrink Larger Images ('>' flag)	convert dragon.gif -resize 64x64\> shrink_dragon.gif
3	Only Enlarge Smaller Images ('<' flag)	The most notable use is with a argument such as '1x1<'. This resize argument will never actually resize any image. In other words it's a no-op, which will allow you to short circuit a resize operation in programs and scripts which always uses "-resize". Other than that you probably do not actually want to use this feature.
4	Fill Area Flag ('^' flag)	convert dragon.gif -resize 64x64^ fill_dragon.gif
5	Percentage Resize ('%' flag)	convert dragon.gif -resize 50% half_dragon.gif. You will have to use param percent from the options in between 0 and 100
6	Resize using a Pixel Area Count Limit ('@' flag)	convert dragon.gif -resize 4096@ pixel_dragon.gif
7	Resize During Image Read	convert dragon.gif'[64x64]' read_dragon.gif You will have to use param area_total_pixels from the options in between 0 and the max value that

srcPath, dstPath and (at least one of) width and height are required. The rest is optional. The size is normally set to be resize_aspect_ratio as true for make the proportional resize operation.

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
});

GIF support

just add gif as the format option in options

options = {format: "gif"}

SVG spport

Fixed (identify) parse could resolve multiline value

  
Clipping path: 
<?xml version="1.0" encoding="iso-8859-1"?>
<svg xmlns="http://www.w3.org/2000/svg" width="1565" height="2319">
<g>
<path fill-rule="evenodd" style="fill:#00000000;stroke:#00000000;stroke-width:0;stroke-antialiasing:false" d="
M 0.218931 0.248387
L 1564.75 0.248387
L 1564.75 2319
L 0.218931 2319
L 0.218931 0.248387 Z
"/>
</g>
</svg>
 

Further tweaks that is worth to check out for memory management.

** http://stackoverflow.com/questions/27917851/broken-results-on-batch-convert-with-imagemagick-command-line-on-linux **

License (MIT)

Copyright (c) 2010-2016 Zyntauri https://zyntauri.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.