private static function placeholder($text)
    {
        $image_manager = new ImageManager(['driver' => 'imagick']);

        $image = $image_manager->canvas(640, 480, '#efefef');

        $image->text($text, 320, 240 - (70 * substr_count($text, "\n")), function ($font) {
            $font->file(base_path('vendor/webfontkit/open-sans/fonts/opensans-regular.woff'));
            $font->size(60);
            $font->color('#cbcbcb');
            $font->align('center');
            $font->valign('center');
        });

        $image_data = (string) $image->encode('gif');

        return 'data:image/gif;base64,'.base64_encode($image_data);
    }