How to set checkerboard pattern as background on any type image using imagick or GD

How to set checkerboard pattern as background on any type image using
imagick or GD

I want to set background like chekerboard pattern on image, but problem is
that when i upload image background becomes white. how can i create
chekerboard background like png background.???
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width,
$height, $this->getWidth(), $this->getHeight());
$img = imagecreatefromstring($new_image); //or whatever loading function
you need $white = imagecolorallocate($img, 255, 255, 255);
imagecolortransparent($img, $white); imagepng($img, $new_image);