Image2Css\Converter::load PHP Method

    public function load($filename)
    {
        $image_info = @getimagesize($filename);
        if ($image_info) {
            $this->type = $image_info[2];
            switch ($this->type) {
                case IMAGETYPE_JPEG:
                    $this->image = imagecreatefromjpeg($filename);
                    break;
                case IMAGETYPE_PNG:
                    $this->image = imagecreatefrompng($filename);
                    break;
                default:
                    throw new \InvalidArgumentException('Image Type not allowed.');
            }
        } else {
            throw new \InvalidArgumentException('The file must be a valid image.');
        }
    }