Add Saturation Module (#193)

* fixed blur module as well as issue with no output when running debug

* added saturation module

* fixing requested changes

* fixing exportBin

* requested fixes

src/modules/Saturation/Module.js

@@ -0,0 +1,66 @@
+/*
+ * Saturate an image
+ */
+module.exports = function Saturation(options,UI) {
+
+  options = options || {};
+  options.title = "Saturation";
+  options.description = "Saturate an image";
+
+  // Tell UI that a step has been set up
+  UI.onSetup(options.step);
+  var output;
+
+  function draw(input,callback) {
+
+    // Tell UI that a step is being drawn
+    UI.onDraw(options.step);
+    var step = this;
+
+    function changePixel(r, g, b, a) {
+
+      var cR = 0.299;
+      var cG = 0.587;
+      var cB = 0.114;
+
+      var p = Math.sqrt((cR * (r*r)) + (cG * (g*g)) + (cB * (g*g)));
+
+      r = p+(r-p)*(options.saturation);
+      g = p+(g-p)*(options.saturation);
+      b = p+(b-p)*(options.saturation);
+
+
+      return [Math.round(r), Math.round(g), Math.round(b), a];
+    }
+
+    function output(image,datauri,mimetype){
+
+      // This output is accesible by Image Sequencer
+      step.output = {src:datauri,format:mimetype};
+
+      // This output is accessible by UI
+      options.step.output = datauri;
+
+      // Tell UI that step ahs been drawn
+      UI.onComplete(options.step);
+    }
+
+    return require('../_nomodule/PixelManipulation.js')(input, {
+      output: output,
+      changePixel: changePixel,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback
+    });
+
+  }
+
+  return {
+    options: options,
+    //setup: setup, // optional
+    draw:  draw,
+    output: output,
+    UI: UI
+  }
+}