PHP | Imagick setImageDepth() Function

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The Imagick::setImageDepth() function is an inbuilt function in PHP which is used to set the depth of a particular image.
Syntax:

bool Imagick::setImageDepth( $depth )

Parameters: This function accepts a single parameter $depth which is an integer value and used to set the depth of image.
Return Value: This function returns true on success.
Below program illustrates the Imagick::setImageDepth() function in PHP:
Original Image:

Program 1:

php

<?php 
 
// require_once('path/vendor/autoload.php');
   
// Create an Imagick Object
$image = new Imagick(
'https://zambiatek.com/wp-content/uploads/2023/10/zambiatek-15-1.png');
   
// Use getImageDepth function to find the depth 
// of image
$res= $image->getImageDepth();
   
// Display the depth of image
echo "Previous Depth" . $res; 
 
$image->setImageDepth(20);
 
$res = $image->getImageDepth();
echo "</br>After Set Depth" . $res; 
?>

Output:

Previous Depth 8
After Set Depth 20

Original Image:

Program 2:

php

<?php 
$string = "Computer Science portal for Geeks!"; 
     
// creating new image of above String 
// and add color and background 
$im = new Imagick(); 
$draw = new ImagickDraw(); 
    
// Fill the color in image 
$draw->setFillColor(new ImagickPixel('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 ImagickPixel('white')); 
             
// Draw the image          
$im->drawImage($draw); 
    
$im->setImageFormat('jpeg');
 
$dpth = $im->getImageDepth();
    
// Display the depth of image
print("Previous Depth = " . $dpth);
  
$im->setImageDepth(20);
$dpthnew = $im->getImageDepth();
  
// Display the depth of image
print("</br>Depth After Set  = " . $dpthnew);
?>