PHP | ImagickKernel fromMatrix() Function

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The ImagickKernel::fromMatrix() function is an inbuilt function in PHP which is used to create a kernel from an 2d matrix of values. The value of 2d matrix is either float if element is used otherwise false if element is skipped.

Syntax:

ImagickKernel ImagickKernel::fromMatrix( array $matrix, array $origin )

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

$matrix: It specifies the matrix of values that define the kernel. Values can be float or false.
$origin (optional): It specifies the element of kernel that should be used as the origin pixel. This is only required in case of non-square matrix.

Return Value: This function returns a new ImagickKernel object on success.

Below programs illustrate the ImagickKernel::fromMatrix() function in PHP:

Program 1:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
$matrix = [ 
    [-1.5, -1, -0.2], 
    [0, 1, 1], 
    [0, 0.5, 1], 
]; 
  
// Create a kernel from matrix 
$kernel = ImagickKernel::fromMatrix($matrix); 
  
// Add the filter 
$imagick->filter($kernel); 
  
// Show the output 
$imagick->setImageFormat('png'); 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

Program 2:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
$matrix = [ 
    [1, 2, -3], 
    [4, 5, 6], 
    [7, 8, 9] 
]; 
  
// Create a kernel from matrix 
$kernel = ImagickKernel::fromMatrix($matrix); 
  
// Get the matrix 
$matrix = $kernel->getMatrix(); 
  
print("<pre>".print_r($matrix, true)."</pre>"); 
?> 

Output:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
            [2] => -3
        )

    [1] => Array
        (
            [0] => 4
            [1] => 5
            [2] => 6
        )

    [2] => Array
        (
            [0] => 7
            [1] => 8
            [2] => 9
        )

)

Reference: https://www.php.net/manual/en/imagickkernel.frommatrix.php

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