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Imagick::setImageClipMask — Sets image clip mask
Sets image clip mask from another Imagick object. This method is available if Imagick has been compiled against ImageMagick version 6.3.6 or newer.
clip_maskThe Imagick object containing the clip mask
   Returns TRUE on success.
  
Throws ImagickException on error.
Example #1 Imagick::setImageClipMask()
<?php
function setImageClipMask($imagePath) {
    $imagick = new \Imagick();
    $imagick->readImage(realpath($imagePath));
    $width = $imagick->getImageWidth();
    $height = $imagick->getImageHeight();
    $clipMask = new \Imagick();
    $clipMask->newPseudoImage(
        $width,
        $height,
        "canvas:transparent"
    );
    $draw = new \ImagickDraw();
    $draw->setFillColor('white');
    $draw->circle(
        $width / 2,
        $height / 2,
        ($width / 2) + ($width / 4),
        $height / 2
    );
    $clipMask->drawImage($draw);
    $imagick->setImageClipMask($clipMask);
    $imagick->negateImage(false);
    $imagick->setFormat("png");
    header("Content-Type: image/png");
    echo $imagick->getImagesBlob();
    
}
?>