PHP | Imagick convolveImage() Function

The Imagick::convolveImage() function is an inbuilt function in PHP which is used to apply a custom convolution kernel to the image.

Syntax:

bool Imagick::convolveImage( $kernel, $channel )

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

• $kernel: This parameter stores the value of the convolution kernel as an array.
• $channel: This parameter stores the value of the channel. The value of default channel is Imagick::CHANNEL_DEFAULT.

Return Value: This function returns True on success.

Original Image:

Below program illustrates the Imagick::convolveImage() function in PHP:

Program:

<?php

// require_once('path/vendor/autoload.php');

/*Imagick Object*/
$image = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-17.png');

$Matrix = [-1, -1, -1, -1, 8, -1, -1, -1, -1, ];
$image->setImageBias(1 * \Imagick::getQuantum());

/*convolveImage*/
$image->convolveImage($Matrix);

/*Image Header*/
header('Content-type: image/png');

// Display output image
echo $image;
?>

Output:

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