diff --git a/src/js/controller/PreviewFilmController.js b/src/js/controller/PreviewFilmController.js
index fc0bf192..d61a80c6 100644
--- a/src/js/controller/PreviewFilmController.js
+++ b/src/js/controller/PreviewFilmController.js
@@ -208,7 +208,6 @@
 
   ns.PreviewFilmController.prototype.getCanvasForFrame = function (frame) {
     var canvas = this.cachedFrameProcessor.get(frame, this.zoom);
-    canvas.classList.add('tile-view', 'canvas');
     return canvas;
   };
 
diff --git a/src/js/model/frame/CachedFrameProcessor.js b/src/js/model/frame/CachedFrameProcessor.js
index cb44e8af..3c0c07aa 100644
--- a/src/js/model/frame/CachedFrameProcessor.js
+++ b/src/js/model/frame/CachedFrameProcessor.js
@@ -1,7 +1,8 @@
 (function () {
   var ns = $.namespace('pskl.model.frame');
 
-  var DEFAULT_RESET_INTERVAL = 10 * 60 *1000;
+
+  var DEFAULT_CLEAR_INTERVAL = 10 * 60 *1000;
 
   var DEFAULT_FRAME_PROCESSOR = function (frame) {
     return pskl.utils.FrameUtils.toImage(frame);
@@ -13,7 +14,7 @@
 
   ns.CachedFrameProcessor = function (cacheResetInterval) {
     this.cache_ = {};
-    this.cacheResetInterval = cacheResetInterval || DEFAULT_RESET_INTERVAL;
+    this.cacheResetInterval = cacheResetInterval || DEFAULT_CLEAR_INTERVAL;
     this.frameProcessor = DEFAULT_FRAME_PROCESSOR;
     this.outputCloner = DEFAULT_OUTPUT_CLONER;
 
@@ -24,14 +25,32 @@
     this.cache_ = {};
   };
 
+  /**
+   * Set the processor function that will be called when there is a cache miss
+   * Function with 1 argument : pskl.model.Frame
+   * @param {Function} frameProcessor
+   */
   ns.CachedFrameProcessor.prototype.setFrameProcessor = function (frameProcessor) {
     this.frameProcessor = frameProcessor;
   };
 
+  /**
+   * Set the cloner that will be called when there is a miss on the 1st level cache
+   * but a hit on the 2nd level cache.
+   * Function with 2 arguments : cached value, frame
+   * @param {Function} outputCloner
+   */
   ns.CachedFrameProcessor.prototype.setOutputCloner = function (outputCloner) {
     this.outputCloner = outputCloner;
   };
 
+  /**
+   * Retrieve the processed frame from the cache, in the (optional) namespace
+   * If the first level cache is empty, attempt to clone it from 2nd level cache. If second level cache is empty process the frame.
+   * @param  {pskl.model.Frame} frame
+   * @param  {String} namespace
+   * @return {Object} the processed frame
+   */
   ns.CachedFrameProcessor.prototype.get = function (frame, namespace) {
     var processedFrame = null;
     namespace = namespace || DEFAULT_NAMESPACE;
@@ -48,7 +67,7 @@
     } else {
       var frameAsString = JSON.stringify(frame.getPixels());
       if (this.cache_[frameAsString]) {
-        processedFrame = this.outputCloner(this.cache_[frameAsString]);
+        processedFrame = this.outputCloner(this.cache_[frameAsString], frame);
       } else {
         processedFrame = this.frameProcessor(frame);
         this.cache_[frameAsString] = processedFrame;