function Zebra_Image()
    {

        // set default values for properties
        $this->chmod_value = 0755;

        $this->error = 0;

        $this->jpeg_quality = 85;

        $this->png_compression = 9;

        $this->preserve_aspect_ratio = $this->preserve_time = $this->enlarge_smaller_images = true;

        $this->sharpen_images = false;

        $this->source_path = $this->target_path = '';

    }