PHP | ImagickKernel scale() Function

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The ImagickKernel::scale() function is an inbuilt function in PHP which is used to scale the given kernel list by the given amount.

Syntax:

void ImagickKernel::scale( float $scale, int $normalizeFlag )

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

$scale: It specifies the amount of scale.
$normalizeFlag: It specifies the type of scale.

Return Value: This function does not return any value.

Below programs illustrate the ImagickKernel::scale() 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 = [ 
    [0, 0, 1], 
    [0, 2, 1], 
    [1, 1, 1], 
]; 
  
// Create a kernel from built-in matrix 
$kernel = ImagickKernel::fromMatrix($matrix); 
  
echo 'Before scaling:<br>'; 
print("<pre>".print_r($kernel->getMatrix(), true)."</pre>"); 
  
// Scale the kernel 
$kernel->scale(5, Imagick::NORMALIZE_KERNEL_VALUE); 
  
echo 'After scaling:<br>'; 
print("<pre>".print_r($kernel->getMatrix(), true)."</pre>"); 
?> 

Output:

Before scaling:
Array
(
    [0] => Array
        (
            [0] => 0
            [1] => 0
            [2] => 1
        )

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

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

)
After scaling:
Array
(
    [0] => Array
        (
            [0] => 0
            [1] => 0
            [2] => 0.71428571428571
        )

    [1] => Array
        (
            [0] => 0
            [1] => 1.4285714285714
            [2] => 0.71428571428571
        )

    [2] => Array
        (
            [0] => 0.71428571428571
            [1] => 0.71428571428571
            [2] => 0.71428571428571
        )

)

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); 
  
// Scale the kernel 
$kernel->scale(4, 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.scale.php

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