PHP | ImagickKernel fromBuiltIn() Function

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The ImagickKernel::fromBuiltIn() function is an inbuilt function in PHP which is used to create a kernel from a builtin kernel.

Syntax:

ImagickKernel ImagickKernel::fromBuiltIn( int $kernelType, string $kernelString )

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

$kernelType: It specifies the type of kernel.
$kernelString: It specifies the string that describe the parameters.

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

Exceptions: This function throws ImagickException on error.

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

Program 1:

<?php 
  
// Create a kernel from matrix 
$kernel = ImagickKernel::fromBuiltIn(Imagick::KERNEL_DIAMOND, "2"); 
  
echo "The matrix of Builtin kernel - Diamond: <br/>"; 
  
// Get the matrix from kernel 
$matrix = $kernel->getMatrix(); 
  
foreach ($matrix as $row) { 
    foreach ($row as $cell) { 
        if ($cell === false) { 
            $output .= "0"; 
        } else { 
            $output .= $cell; 
        } 
    } 
    $output .= "<br>"; 
} 
  
echo $output; 
?> 

Output:

The matrix of Builtin kernel - Diamond:
00100
01110
11111
01110
00100

Program 2:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
// Create a kernel from built In types 
$kernel = ImagickKernel::fromBuiltIn(Imagick::KERNEL_SQUARE, "2"); 
  
// Scale the kernel 
$kernel->scale(2, Imagick::NORMALIZE_KERNEL_VALUE); 
  
// Add the filter 
$imagick->filter($kernel); 
  
// Show the output 
$imagick->setImageFormat('png'); 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

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

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