(PECL imagick 2, PECL imagick 3)
Imagick::setImagePage — Sets the page geometry of the image
public Imagick::setImagePage ( int $width , int $height , int $x , int $y ) : bool
Sets the page geometry of the image.
width
height
x
y
 Returns true on success. 
Throws ImagickException on error.
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    https://www.php.net/manual/en/imagick.setimagepage.php