Pimcore\Image\Optimizer::optimizePngout PHP Method

    public static function optimizePngout($path)
    {
        $bin = \Pimcore\Tool\Console::getExecutable("pngout", false);
        if ($bin) {
            $newFile = self::getTempFile("png");
            Console::exec($bin . " " . escapeshellarg($path) . " " . $newFile, null, 60);
            if (file_exists($newFile)) {
                return $newFile;
            }
        }
        return null;
    }