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PHP | Imagick addNoiseImage() Function
  • Difficulty Level : Easy
  • Last Updated : 26 Aug, 2019

The Imagick::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:

bool Imagick::addNoiseImage ( $noise_type, $channel )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $noise_type: This parameter is used to set the noise types. There are some noise constants available in Imagick function which are listed below:
    • imagick::NOISE_UNIFORM
    • imagick::NOISE_GAUSSIAN
    • imagick::NOISE_MULTIPLICATIVEGAUSSIAN
    • imagick::NOISE_IMPULSE
    • imagick::NOISE_LAPLACIAN
    • imagick::NOISE_POISSON
    • imagick::NOISE_RANDOM

    This constant supports on ImageMagick version 6.3.6 and above.

  • $channel: This parameter provides the channel constants. Two or more channel can be combined using bitwise operator. There are some channel constants available in Imagick function which are listed below:
    • imagick::CHANNEL_UNDEFINED
    • imagick::CHANNEL_RED
    • imagick::CHANNEL_GRAY
    • imagick::CHANNEL_CYAN
    • imagick::CHANNEL_GREEN
    • imagick::CHANNEL_MAGENTA
    • imagick::CHANNEL_BLUE
    • imagick::CHANNEL_YELLOW
    • imagick::CHANNEL_ALPHA
    • imagick::CHANNEL_OPACITY
    • imagick::CHANNEL_MATTE
    • imagick::CHANNEL_BLACK
    • imagick::CHANNEL_INDEX
    • imagick::CHANNEL_ALL
    • imagick::CHANNEL_DEFAULT

Return Value: This function returns TRUE on success.

Below program illustrate the Imagick::addNoiseImage() function in PHP:



Original Image:
original image
Program:




<?php 
  
// require_once('path/to/vendor/autoload.php'); 
  
header('Content-type: image/png');
  
$image = new Imagick(
  
$image->addNoiseImage(3, imagick::CHANNEL_DEFAULT);
  
echo $image;
?>

Output:

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

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