Image_GD::_do_save PHP Method

    protected function _do_save($file, $quality)
    {
        // Loads image if not yet loaded
        $this->_load_image();
        // Get the extension of the file
        $extension = pathinfo($file, PATHINFO_EXTENSION);
        // Get the save function and IMAGETYPE
        list($save, $type) = $this->_save_function($extension, $quality);
        // Save the image to a file
        $status = isset($quality) ? $save($this->_image, $file, $quality) : $save($this->_image, $file);
        if ($status === TRUE and $type !== $this->type) {
            // Reset the image type and mime type
            $this->type = $type;
            $this->mime = image_type_to_mime_type($type);
        }
        return TRUE;
    }