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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(
  
// 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



Last Updated : 14 Jan, 2020
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