# node-optipng

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The optipng command line utility as a readable/writable stream. This
is handy for situations where you don't want to worry about writing
the input to disc and reading the output afterwards.

If you don't have an `optipng` binary in your PATH, `node-optipng`
will try to use one of the binaries provided by <a
href="https://github.com/yeoman/node-optipng-bin">the node-optipng-bin
package</a>.

The constructor optionally takes an array of command line options for
the `optipng` binary:

```javascript
var OptiPng = require('optipng'),
  myOptimizer = new OptiPng(['-o7']);

sourceStream.pipe(myOptimizer).pipe(destinationStream);
```

OptiPng as a web service:

```javascript
var OptiPng = require('optipng'),
  http = require('http');

http
  .createServer(function (req, res) {
    if (req.headers['content-type'] === 'image/png') {
      res.writeHead(200, { 'Content-Type': 'image/png' });
      req.pipe(new OptiPng(['-o7'])).pipe(res);
    } else {
      res.writeHead(400);
      res.end('Feed me a PNG!');
    }
  })
  .listen(1337);
```

## Installation

Make sure you have node.js and npm installed, then run:

    npm install optipng

## Releases

[Changelog](https://github.com/papandreou/unexpectednode-optipng/blob/master/CHANGELOG.md)

## License

3-clause BSD license -- see the `LICENSE` file for details.