Imagick::setImageBackgroundColor

<?php

  $im = new \Imagick();

        /* read image (914x784) */
   
     $im->readImage($_SERVER['DOCUMENT_ROOT']."/path/toimage/".$inputfront);
        
        $im->setImageBackgroundColor(new \ImagickPixel('transparent')); /* this is equal to -background none (in imagemagick command options ) */
  
        /*Control points for the distortion in order to check weather setImageBackgound is working properly*/

        $controlPoints = array( 0,0,
            280,0,

            994,0,
            914,50,

            994,862,
            784,842,

            0,862,
            110,762);

        /* Perform the distortion */
        $im->distortImage(\Imagick::DISTORTION_PERSPECTIVE, $controlPoints, true);

        /* Ouput the image */
        $output_front_distort="Projects/path/where you want to store image/distorted_book.png";
    
       header("Content-Type: image/png");
        $im->writeImage($_SERVER['DOCUMENT_ROOT']."/designerr/public/".$output_front_distort);

?>