asciidisco.com/build/node_modules/pngout-bin/README.md

pngout-bin

pngout optimizes the size of PNG files losslessly

Install

$ npm install --save pngout-bin

Usage

var execFile = require('child_process').execFile;
var pngout = require('pngout-bin').path;

execFile(pngout, ['input.png', 'output.png', '-s0', '-k0', '-f0'], function (err) {
	if (err) {
		throw err;
	}

	console.log('Image minified!');
});

CLI

$ npm install --global pngout-bin

$ pngout --help

License

MIT © imagemin