'A version of ``Thumbnailer.get_thumbnail_name`` that returns the original
filename to resize.'

def get_thumbnail_name(self, thumbnail_options, transparent=False, high_resolution=False):

    (path, filename) = os.path.split(self.name)
    basedir = self.thumbnail_basedir
    subdir = self.thumbnail_subdir
    return os.path.join(basedir, path, subdir, filename)
