code: def _load_megapixels(self,directory):
          
          #FIXME: should check if DB tracking file before using it
  
          fullfile=os.path.join(directory,MEGAPIXEL_FILE)
          try:
              mp=float(open(fullfile).readline())
              logger.debug("_load_megapixel: MP from file is %f",mp)
          except:
              logger.warning("Couldn't open image size file in %s, not scaling images"\
                      %(directory))
              return None
  
          return mp
docs: Opens megapixel file, if contains '3.5' for instance,
          will scale all uploaded photos in directory this this size,
          the original photo is untouched. Returns None if
          file not found