IMMP: Image Manipulation Middleware Proxy

This is an express middleware for manipulating images with imageMagick/graphicsMagic. You can also set it up to act as a proxy.

This is very useful for web development where thumbnails and cropping is done. Instead of doing it by hand, just specify the size and ratio in the url.

http://localhost:3000/im/?image=test.jpg&crop=16x9&resize=200x113

If you enable proxy mode, you can proxy images from other services like Amazon S3

http://localhost:3000/im/?http://s3.amazonaws.com/yourbucket/youimg.png&crop=1x1

Install

Install the immp module with

npm install --save immp

You will also need either imageMagick or graphicsMagic installed.

On linux install them using:

sudo apt-get install imagemagick graphicsmagick

or Mac

brew install imagemagick
brew install graphicsmagick

Setup

In your app.js (assuming a standard express.js setup), add the following lines.

var immp = require('immp');

app.use('/im/*', immp({
    ttl: 1000 * 60 * 60 * 24 * 7, // 1 week
    imageMagick: true,
    graphicsMagick: true,
    cacheFolder: os.tmpdir(),
    allowProxy: false,
    imageDir: process.cwd()
}));

All of the config variables are optional and default to the values in the example above.

API Usage

Crop an image to 16:9

http://localhost:3000/im/?image=test.jpg&crop=16x9

Resize an image to 100x100

http://localhost:3000/im/?image=test.jpg&resize=100x100

Resize to 100x100 and change the ratio to 1:1

http://localhost:3000/im/?image=test.jpg&crop=1x1&resize=100x100

Crop the source image to the custom shape (source width, height, x, and y). See GraphicsMagic crop for more information. Non-negative integers only.

http://localhost:3000/im/?image=test.jpg&sx=100&sy=100&sw=100&sy=100

If you enable proxy mode, you can proxy images from other services like Amazon S3

http://localhost:3000/im/?http://s3.amazonaws.com/yourbucket/youimg.png&crop=1x1

Development

If you want to help contribute (thank you), there is an included server and test images in the that will help you. No automated unit tests yet though.

Setup with

git clone git@github.com:garrows/IMMP.git
cd IMMP
npm install
npm start

Now go to http://localhost:3000/

For faster development open these 2 commands in different windows

nodemon
live-reload --port=35729 --delay=600