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readme.md
pngquant-bin 
pngquant is a command-line utility for converting 24/32-bit PNG images to paletted (8-bit) PNGs. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency.
Install
$ npm install --save pngquant-bin
Usage
const execFile = require('child_process').execFile;
const pngquant = require('pngquant-bin');
execFile(pngquant, ['-o', 'output.png', 'input.png'], err => {
console.log('Image minified!');
});
CLI
$ npm install --global pngquant-bin
$ pngquant --help
License
MIT © imagemin