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);?>