The pngquant command line utility as a readable/writable stream.
The constructor optionally takes an array of command line options for
the pngquant binary (defaults to [256]):
var PngQuant = require('pngquant'),
myPngQuanter = new PngQuant([192, '--quality', '60-80', '--nofs', '-']);
sourceStream.pipe(myPngQuanter).pipe(destinationStream);PngQuant as a web service (sends back a png with the number of colors quantized to 128):
var PngQuant = require('pngquant'),
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 PngQuant([128])).pipe(res);
} else {
res.writeHead(400);
res.end('Feed me a PNG!');
}
}).listen(1337);Make sure you have node.js and npm installed, and that the pngquant binary is in your PATH, then run:
npm install pngquant
3-clause BSD license -- see the LICENSE file for details.