PHP | Gmagick reducenoiseimage() Function

Last Updated : 11 Jul, 2025

The Gmagick::reducenoiseimage() function is an inbuilt function in PHP which is used to set smooth contours of an image while still preserving edge information. The algorithm works by replacing each pixel with its neighbor closest value.
Syntax:

Gmagick Gmagick::reducenoiseimage( $radius )

Parameters: This function accepts a single parameter $radius which is used to set the radius of the neighborhood pixel.
Return Value: This function returns Gmagick object on success.
Errors/Exceptions: This function throws GmagickException on error.
Below programs illustrates the Gmagick::reducenoiseimage() function in PHP:
Program 1:
Input Image:

php

<?php 
  
// Create a Gmagick object 
$gmagick = new Gmagick(
'https://media.geeksforgeeks.org/wp-content/uploads/tech.png'); 
  
// Reduce Noise in the image. 
$gmagick->reducenoiseimage(7); 

header('Content-type: image/png'); 
  
// Output the image 
echo $gmagick; 
?>

Output:

Program 2:

php

<?php 
   
// Create a GmagickDraw object 
$draw = new GmagickDraw(); 
  
// Create GmagickPixel object 
$strokeColor = new GmagickPixel('Red'); 
$fillColor = new GmagickPixel('Green'); 
  
// Set the color, opacity of image 
$draw->setStrokeOpacity(1); 
$draw->setStrokeColor('Red'); 
$draw->setFillColor('Green'); 
  
// Set the width and height of image 
$draw->setStrokeWidth(7); 
$draw->setFontSize(72); 
   
// Function to draw circle  
$draw->circle(250, 250, 100, 150); 
 
$gmagick = new Gmagick(); 
$gmagick->newImage(500, 500, 'White'); 
$gmagick->setImageFormat("png"); 
$gmagick->drawImage($draw); 

// Reduce Noise in the image
$gmagick->resampleimage(90, 90, 6, 10);
 
// Display the output image 
header("Content-Type: image/png"); 
echo $gmagick->getImageBlob(); 
?>