code: public String getFiltersString() {
  
          StringBuffer result = new StringBuffer();
          Iterator<String> i = m_filters.iterator();
          while (i.hasNext()) {
              String filter = i.next();
              result.append(filter);
              if (i.hasNext()) {
                  result.append(':');
              }
          }
          return result.toString();
      }
docs: Returns the list of image filter names (Strings) to be applied to the image as a String.<p>
  
  @return the list of image filter names (Strings) to be applied to the image as a String