diff --git a/.gitignore b/.gitignore
index aaecf7c..4abb119 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,4 +28,3 @@ node_modules
 
 example/public/generated/*
 example/node_modules
-lib
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..4ea5dee
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,245 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
+
+var _fs = require('fs');
+
+var _fs2 = _interopRequireDefault(_fs);
+
+var _gm = require('gm');
+
+var _gm2 = _interopRequireDefault(_gm);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function isNumeric(n) {
+  return !isNaN(parseFloat(n)) && isFinite(n);
+}
+
+var Aquarelle = function () {
+  function Aquarelle(baseDir, verbose) {
+    var _this = this;
+
+    _classCallCheck(this, Aquarelle);
+
+    this.log = function () {
+      var _console;
+
+      return verbose ? (_console = console).log.apply(_console, arguments) : false;
+    };
+    this.log('\nInitializing Aquarelle...');
+
+    if (typeof baseDir !== 'string') throw new Error('Aquarelle - missing baseDir arg in constructor');
+
+    this.fileList = [];
+    this.fileCount = 0;
+    this.dataExtractionRegexp = /\((.*)\)$/;
+    this.baseDir = baseDir.endsWith('/') ? baseDir : baseDir + '/';
+
+    // Loops through every file in baseDir to find images
+    this.ready = new Promise(function (resolve, reject) {
+
+      _fs2.default.readdir(baseDir, function (err, files) {
+        if (err) return reject('Cannot read given baseDir', _this.baseDir);
+
+        var statsPromises = [];
+        var extensionRegexp = /(?:\.([^.]+))?$/;
+        var validExtensionsRegexp = /png|jpe?g|webp|tiff|gif/i;
+
+        files.forEach(function (file) {
+          return statsPromises.push(new Promise(function (resolve, reject) {
+            var filePath = _this.baseDir + file;
+
+            _fs2.default.stat(filePath, function (err, stats) {
+              if (err) return reject('Error while reading file', filePath);
+              if (stats && stats.isFile()) {
+
+                var extension = extensionRegexp.exec(file)[1];
+                if (extension && validExtensionsRegexp.test(extension)) _this.fileList.push(filePath);
+              }
+              resolve();
+            });
+          }));
+        });
+
+        Promise.all(statsPromises).then(function () {
+          var n = _this.fileList.length;
+          _this.fileCount = n;
+
+          if (n) {
+            _this.log('Ready! ' + n + ' valid images found.');
+            resolve();
+          } else reject('No valid image found in', _this.baseDir);
+        });
+      });
+    });
+  }
+
+  _createClass(Aquarelle, [{
+    key: '_extractData',
+    value: function _extractData(data) {
+      // Data from GM looks like 'rbg (frac)'. We only need the frac part * 100.
+      return parseFloat(data.match(this.dataExtractionRegexp)[1], 10) * 100;
+    }
+
+    // Validates options, applies defaults and waits for baseDir scan to be over before calling the main loop
+    // Returns a valid thumbnail
+
+  }, {
+    key: '_generateImage',
+    value: function _generateImage(options) {
+      var _this2 = this;
+
+      var errors = [];
+      var width = options.width;
+      var height = options.height;
+      var minBrightness = options.minBrightness;
+      var maxBrightness = options.maxBrightness;
+      var minSD = options.minSD;
+      var maxIterations = options.maxIterations;
+
+      if (minSD && !isNumeric(minSD)) errors.push('Invalid minSD: ' + minSD);
+      if (!width || !isNumeric(width)) errors.push('Invalid width: ' + width);
+      if (height && !isNumeric(height)) errors.push('Invalid height: ' + height);
+      if (minBrightness && !isNumeric(minBrightness)) errors.push('Invalid minBrightness: ' + minBrightness);
+      if (maxBrightness && !isNumeric(maxBrightness)) errors.push('Invalid maxBrightness: ' + maxBrightness);
+      if (maxIterations && !isNumeric(maxIterations)) errors.push('Invalid maxIterations: ' + maxIterations);
+
+      if (errors.length) return Promise.reject(errors.join('; '));
+
+      options.width = Math.abs(width);
+      options.minSD = minSD || 15;
+      options.minBrightness = minBrightness || 30;
+      options.maxBrightness = maxBrightness || 80;
+      options.maxIterations = maxIterations || 15;
+
+      return this.ready.then(function () {
+        return _this2._generateValidImage(options, 1);
+      });
+    }
+
+    // Will loop until a image passes the quality check
+
+  }, {
+    key: '_generateValidImage',
+    value: function _generateValidImage(options, cycleCount) {
+      var _this3 = this;
+
+      this.log('_generateValidImage', cycleCount);
+
+      return new Promise(function (resolve, reject) {
+
+        if (cycleCount > options.maxIterations) return reject('Too many cycles, check your base images or verify that the requested dimensions are not too big.');
+
+        var tryAgain = function tryAgain() {
+          return _this3._generateValidImage(options, cycleCount + 1).then(resolve, reject);
+        };
+
+        var filePath = _this3.fileList[Math.floor(Math.random() * _this3.fileCount)];
+        var image = (0, _gm2.default)(filePath).size(function (err, _ref) {
+          var width = _ref.width;
+          var height = _ref.height;
+
+          if (err) return reject('Error while reading image\'s dimensions for file ' + filePath + ': ' + err.message);
+
+          _this3.log(filePath);
+
+          var newWidth = options.width;
+          var newHeight = options.height || newWidth;
+
+          if (newWidth > width || newHeight > height) return tryAgain();
+
+          var x = Math.floor(Math.random() * (width - newWidth));
+          var y = Math.floor(Math.random() * (height - newHeight));
+
+          image.crop(newWidth, newHeight, x, y).toBuffer(function (err, buffer) {
+            // toBuffer allows working on the cropped file
+            if (err) return reject('Error while buffering file ' + filePath + ': ' + err.message);
+
+            var thumbnail = (0, _gm2.default)(buffer).identify(function (err, metadata) {
+              if (err) return reject('Error while identifying cropped image ' + filePath + ': ' + err.message);
+
+              var means = [];
+              var standardDeviations = [];
+              var minSD = options.minSD;
+              var minBrightness = options.minBrightness;
+              var maxBrightness = options.maxBrightness;
+              var _metadata$ChannelSta = metadata['Channel Statistics'];
+              var Red = _metadata$ChannelSta.Red;
+              var Green = _metadata$ChannelSta.Green;
+              var Blue = _metadata$ChannelSta.Blue;
+
+              if (!(Red && Green && Blue)) return tryAgain();
+
+              [Red, Green, Blue].forEach(function (channel) {
+                means.push(_this3._extractData(channel.Mean));
+                standardDeviations.push(_this3._extractData(channel['Standard Deviation']));
+              });
+
+              var a = means[0];
+              var b = means[1];
+              var c = means[2];
+
+              var brightness = Math.round(Math.sqrt(0.299 * a * a + 0.587 * b * b + 0.144 * c * c));
+              var minOfSD = Math.min.apply(Math, standardDeviations);
+
+              _this3.log('minOfSD', minOfSD);
+              _this3.log('brightness', brightness);
+
+              // Quality condition, v2
+              if (minOfSD > minSD && brightness > minBrightness && brightness < maxBrightness) resolve({ thumbnail: thumbnail, originalImageName: filePath.split('/').pop() });else tryAgain();
+            });
+          });
+        });
+      });
+    }
+  }, {
+    key: 'generateFile',
+    value: function generateFile(newFilePath, options) {
+      var _this4 = this;
+
+      return new Promise(function (resolve, reject) {
+
+        _this4._generateImage(options).then(function (_ref2) {
+          var thumbnail = _ref2.thumbnail;
+          var originalImageName = _ref2.originalImageName;
+
+          thumbnail.write(newFilePath, function (err) {
+            if (err) return reject('Error while saving new file: ' + err.message);
+
+            resolve({ originalImageName: originalImageName });
+          });
+        }, reject);
+      });
+    }
+  }, {
+    key: 'generateStream',
+    value: function generateStream(options) {
+      var _this5 = this;
+
+      return new Promise(function (resolve, reject) {
+
+        _this5._generateImage(options).then(function (_ref3) {
+          var thumbnail = _ref3.thumbnail;
+          var originalImageName = _ref3.originalImageName;
+
+          thumbnail.stream(function (err, stdout, stderr) {
+            if (err) return reject('Error while streaming new image: ' + err.message);
+
+            resolve({ stdout: stdout, stderr: stderr, originalImageName: originalImageName });
+          });
+        }, reject);
+      });
+    }
+  }]);
+
+  return Aquarelle;
+}();
+
+exports.default = Aquarelle;
\ No newline at end of file
diff --git a/package.json b/package.json
index d3c2e3d..0f73324 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "aquarelle",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Random profile pictures with a sense of Art.",
   "main": "lib/index.js",
   "directories": {