NodeJs running ImageMagick convert all images from directory

Question

This is basic imagemagick setup for node.js that i came across lately. I understand that question i'm asking is very newbie but i'm new to node js and imagemagick and i wanted to try to make it dynamic. Current script bellow is cropping one specific file, is there a way to make it to apply conversion to all the files from directory /before and then output it to directory /after ? Also the operation i want to do for all the images in directory is to apply watermark on each (crop operation in code is just from example).

var http = require("http"); var im = require("imagemagick"); var args = [ "image.png", "-crop", "120x80+30+15", "output.png" ]; var server = http.createServer(function(req, res) { im.convert(args, function(err) { if(err) { throw err; } res.end("Image crop complete"); }); }).listen(8080);

vanadium23 · Accepted Answer · 2015-05-16 11:37:30Z

Yes, you can do it by implementing foreach by all files itself. Also you will need to install async module:

npm install async

Example code:

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); }

Then in you code:

var http = require("http"); var resize = require("./resize"); var server = http.createServer(function(req, res) { resize({ src: '/source/folder', dest: '/destination/folder', width: 300 }); }).listen(8080);

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