DarkroomJS

DarkroomJS is a JavaScript library which provides basic image editing tools in your browser, such as rotation or cropping. It is based on the awesome FabricJS library to handle images in HTML5 canvas.

Demo

Try the online demo at http://mattketmo.github.io/darkroomjs

The library is currently work in progress. I know there is some bug especially when resizing the crop zone. Feel free to fork the project or report issues on GitHub. All ideas are also welcome.

Building

• Install Node
• Install Grunt
• The webfont is auto generated from SVG icons. This uses the grunt-webfont task which requires fontforge and ttfautohint. See the readme for more details.
• Run npm install
• Run grunt build

Every assets will be generated into the build/ directory.

Usage

Simply instanciate a new Darkroom object with a reference to the image element:

<img src="some-image.jpg" id="target">
<script>
  new Darkroom('#target');
</script>

You can also pass some options:

new Darkroom('#target', {
  // Canvas initialization size
  minWidth: 100,
  minHeight: 100,
  maxWidth: 500,
  maxHeight: 500,

  // Plugins options
  plugins: {
    crop: {
      minHeight: 50,
      minWidth: 50,
      ratio: 1
    },
    save: false // disable plugin
  },
});

Why?

It's easy to get a javascript script to crop an image in a web page. But if your want more features like rotation or brightness adjustment, then you will have to do it yourself. No more jQuery plugins here. It only uses the power of HTML5 canvas to make what ever you want with your image.

The concept

The library is designed to be easily extendable. The core script only transforms the target image to a canvas with a FabricJS instance, and creates an empty toolbar. All the features are then implemented in separate plugins.

Each plugin is responsible for creating its own functionality. Buttons can easily be added to the toolbar and binded with those features.

License

DarkroomJS is released under the MIT License. See the bundled LICENSE file for details.