https://github.com/sindresorhus/awesome-nodejs#image

https://github.com/aheckmann/gm/blob/master/lib%2Fcomposite.js http://www.graphicsmagick.org/composite.html

/**
 * Composite images together using the `composite` command in graphicsmagick.
 *
 * gm('/path/to/image.jpg')
 * .composite('/path/to/second_image.jpg')
 * .geometry('+100+150')
 * .write('/path/to/composite.png', function(err) {
 *   if(!err) console.log("Written composite image.");
 * });
 *
 * @param {String} other  Path to the image that contains the changes.
 * @param {String} [mask] Path to the image with opacity informtion. Grayscale.
 */

想不到这个库居然是 spawn 实现的

@magicdawn spawn实现有什么不好的地方吗

@suntopo 可能QPS会过低吧~没测过