·

6.038K

· vvo

This handy resize module will not kill your server, thanks to async's queue.
At max it will fork .cpus().length image magick processes.

var
 async = require('async'),
 fs = require('fs'),
 im = require('imagemagick'),
 maxworkers = require('os').cpus().length,
 path = require('path');

module.exports = resize;

function resize(params) {
 var queue = async.queue(resizeimg, maxworkers);

 fs.readdir(params.src, function(err, files) {
 files.forEach(function(file) {
 queue.push({
 src: path.join(params.src, '/', file),
 dest: path.join(params.dest, '/', file),
 width: params.width,
 height: params.height
 })
 });
 });
}

function resizeimg(params, cb) {
 var imoptions = {
 srcPath: params.src,
 dstPath: params.dest
 };
 if (params.width !== undefined) imoptions.width = params.width;
 if (params.height !== undefined) imoptions.height = params.height
 im.resize(imoptions, cb);
}

Usage:

resize({
 src: '/source/folder',
 dest: '/destination/folder',
 width: 300
});

You can provide only width or only height or both.

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