Add comments; Remove do-nothing, do-nothing-pix

src/modules/Invert/Module.js

@@ -6,24 +6,35 @@ module.exports = function GreenChannel(options,UI) {
   options = options || {};
   options.title = "Invert Colors";
   options.description = "Inverts the colors of the image";
+
+  // Tell UI that a step has been set up.
   UI.onSetup(options.step);
   var output;
 
-  //function setup() {} // optional
-
+  // The function which is called on every draw.
   function draw(input,callback) {
 
+    // Tell UI that a step is being drawn.
     UI.onDraw(options.step);
+
     const step = this;
 
     function changePixel(r, g, b, a) {
       return [255-r, 255-g, 255-b, a];
     }
+
     function output(image,datauri,mimetype){
+
+      // This output is accessible by Image Sequencer
       step.output = {src:datauri,format:mimetype};
+
+      // This output is accessible by UI
       options.step.output = datauri;
+
+      // Tell UI that step has been drawn.
       UI.onComplete(options.step);
     }
+
     return require('../_nomodule/PixelManipulation.js')(input, {
       output: output,
       changePixel: changePixel,
@@ -36,7 +47,6 @@ module.exports = function GreenChannel(options,UI) {
 
   return {
     options: options,
-    //setup: setup, // optional
     draw:  draw,
     output: output,
     UI: UI