Grafika\Gd\Image::_createGif PHP Method

    private static function _createGif($imageFile)
    {
        $gift = new GifHelper();
        $bytes = $gift->open($imageFile);
        $animated = $gift->isAnimated($bytes);
        $blocks = '';
        if ($animated) {
            $blocks = $gift->decode($bytes);
        }
        $gd = @imagecreatefromgif($imageFile);
        if (!$gd) {
            throw new \Exception(sprintf('Could not open "%s". Not a valid %s file.', $imageFile, ImageType::GIF));
        }
        return new self($gd, $imageFile, imagesx($gd), imagesy($gd), ImageType::GIF, $blocks, $animated);
    }