Fix : add a step in the demo

index.html

@@ -72,10 +72,9 @@
         //sequencer.addStep('plot');
 
         $('.add-step').click(function(e) {
-
           e.preventDefault();
           sequencer.addStep($('.select-module').val());
-          sequencer.run(); // later we might only run this step, if we can fetch the image output from the previous
+          sequencer.run(document.image); // later we might only run this step, if we can fetch the image output from the previous
 
         });
 

src/ImageSequencer.js

@@ -89,6 +89,7 @@ ImageSequencer = function ImageSequencer(options) {
     image.onload = function() {
       run(image);
       if (callback) callback(image);
+      document.image = image;
     }
     image.src = src;
   }

src/modules/ImageSelect.js

@@ -42,7 +42,7 @@ module.exports = function ImageSelect(options) {
 
           image = new Image();
           image.src = event.target.result;
-
+          document.image = image;
           el.html(image); // may be redundant
 
           // this is done once per image: