code: private double getCropScaleFactor() {
      RenditionMetadata original = getOriginalRendition();
      RenditionMetadata webEnabled = AutoCropping.getWebRenditionForCropping(getAsset());
      if (original == null || webEnabled == null || original.getWidth() == 0 || webEnabled.getWidth() == 0) {
        return 1d;
      }
      return (double)original.getWidth() / (double)webEnabled.getWidth();
    }
docs: The cropping coordinates are stored with coordinates relating to the web-enabled rendition. But we want
  to crop the original image, so we have to scale those values to match the coordinates in the original image.
  @return Scale factor