Transparent background

[NoahDragon]

From: https://wordpress.org/support/topic/transparent-background-49/

        // create backgound
        $monster = @imagecreatetruecolor(256, 256)
        or die("GD image create failed");
        $color   = imagecolorallocatealpha($monster, 0, 0, 0, 127);
        imagesavealpha($monster, true);
	imagefill($monster,0,0,$color);
        imagefilledrectangle($monster, 0, 0, 256, 256, $color);

[NoahDragon]

Supported in 2.0. 468a161