ImageComponent::SaveImage PHP Method

    function SaveImage($im, $filename)
    {
        $res = null;
        // ImageGIF is not included into some GD2 releases, so it might not work
        // output png if gifs are not supported
        if ($this->image_type == 1 && !function_exists('imagegif')) {
            $this->image_type = 3;
        }
        switch ($this->image_type) {
            case 1:
                if ($this->save_to_file) {
                    //$res = ImageGIF($im,$filename);
                    $res = ImageGIF($im, NULL);
                } else {
                    header("Content-type: image/gif");
                    $res = ImageGIF($im);
                }
                break;
            case 2:
                if ($this->save_to_file) {
                    $res = ImageJPEG($im, NULL, $this->quality);
                } else {
                    header("Content-type: image/jpeg");
                    $res = ImageJPEG($im, NULL, $this->quality);
                }
                break;
            case 3:
                if (PHP_VERSION >= '5.1.2') {
                    // Convert to PNG quality.
                    // PNG quality: 0 (best quality, bigger file) to 9 (worst quality, smaller file)
                    $quality = 9 - min(round($this->quality / 10), 9);
                    if ($this->save_to_file) {
                        //$res = ImagePNG($im, $filename, $quality);
                        $res = ImagePNG($im, NULL, $quality);
                    } else {
                        header("Content-type: image/png");
                        $res = ImagePNG($im, NULL, $quality);
                    }
                } else {
                    if ($this->save_to_file) {
                        $res = ImagePNG($im, $filename);
                    } else {
                        header("Content-type: image/png");
                        $res = ImagePNG($im);
                    }
                }
                break;
        }
        return $res;
    }