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.
$ npm install --save pngquant-binvar execFile = require('child_process').execFile; var pngquant = require('pngquant-bin').path; execFile(pngquant, ['-o', 'output.png', 'input.png'], function (err) { if (err) { throw err; } console.log('Image minified!'); });$ npm install --global pngquant-bin$ pngquant --helpMIT © imagemin