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PHP | Gmagick addnoiseimage() Function
  • Last Updated : 06 Nov, 2020

The Gmagick::addnoiseimage() function is an inbuilt function in PHP which is used to add noise in given image. The intensity of noise depends on noise constants and channel types. The image noise is the random variation of brightness and contrast in an image.

Syntax: 

Gmagick Gmagick::addnoiseimage ( $noise_type )

Parameters: This function accepts a single parameter $noise_type which is used to set the noise types.

Return Value: This function returns the Gmagick object with noise.

Errors/Exceptions: This function throws GmagickException on error.



Below programs illustrates the Gmagick::addnoiseimage() function in PHP:

Original Image 1: 
 

Program 1: 

PHP




<?php
   
// Create a Gmagick object
$gmagick = new Gmagick(
   
// Add noise in image.
$gmagick->addnoiseimage(2);
 
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);
 
// Add noise in the image
$gmagick->addnoiseimage(5);
  
// Display the output image
header("Content-Type: image/png");
echo $gmagick->getImageBlob();
?>

Output: 
 

Reference: http://php.net/manual/en/gmagick.addnoiseimage.php
 

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