PHP | Gmagick getImageMatte() Function

<?php

// Create new Gmagick object
$gmagick = new Gmagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png');

// Using getImageMatte function
$res = $Gmagick->getImageMatte();

// header("Content-Type: image/jpg");
echo $res;

?>

<?php 
$string = "Computer Science portal for Geeks!"; 

// Creating new image of above String 
// and add color
$im = new Gmagick(); 
$draw = new GmagickDraw(); 

// Fill the color in image 
$draw->setFillColor(new GmagickPixel('green')); 

// Set the text font size 
$draw->setFontSize(50); 

$matrix = $im->queryFontMetrics($draw, $string); 
$draw->annotation(0, 40, $string); 
$im->newImage($matrix['textWidth'], $matrix['textHeight'], 
        new GmagickPixel('white')); 
// Draw the image         
$im->drawImage($draw); 
$im->setImageFormat('jpeg'); 

$res = $im->getImageMatte();

// Display Result
echo $res;
?>