public function getIndexedFilename()
{
$output = pathinfo($this->getZipFileIn(), PATHINFO_FILENAME);
$output = str_replace('.' . $this->getExtension(), '', $output);
$output .= $this->getImageIndex();
$output .= '.' . $this->getExtension();
$output = str_replace(' ', '_', $output);
return $output;
}