如何使用Imagick CompositeImage合成2个图像？

Question

I am having trouble with compositeImage. I just want to compose two images (put a company logo onto a phone case) and what I am getting is a 16x16 white border square. I've followed this documentation. Here is my code:

    $imagick1 = new Imagick(__DIR__ . '/release/images/'.$theme_param.'_'.$case_param.'_'.$phone_param.'.jpg');
    $imagick2 = new Imagick(__DIR__ . '/release/images/cariocamobile_'.$logo_param.'.png');
    $imagick1->compositeImage($imagick2, Imagick::COMPOSITE_DEFAULT, 0, 0);
    $imagick1->setImageFormat('png');

    $imagick1->setImageFormat("png");
    header("Content-Type: image/png");
    echo $imagick1->getImageBlob();

Also, I want to use Imagick::ATOP instead of Imagick::COMPOSITE_DEFAULT. How can I use it?

What I want to do

What I am getting