The ImagickKernel::addKernel() function is an inbuilt function in PHP which is used to attach another kernel to this kernel. Using this function we can attach multiple matrices to the same kernel and use whichever we want.
Syntax:
void ImagickKernel::addKernel( ImagickKernel $ImagickKernel )
Parameters: This function accepts a single parameter $ImagickKernel which holds the kernel.
Return Value: This function returns TRUE on success.
Exceptions: This function throws ImagickException on error.
Below programs illustrate the ImagickKernel::addKernel() function in PHP:
Program 1:
<?php   // Create a new imagick object $imagick = new Imagick(   $matrix1 = [     [-1, -1, -1],     [4, 4, 4],     [1, 1, 1], ];   $matrix2 = [     [-1, 0, 0],     [0, 0, 1],     [-1, 0, 1], ];   // Create ImagickKernel objects from matrices $kernel1 = ImagickKernel::fromMatrix($matrix1); $kernel2 = ImagickKernel::fromMatrix($matrix2);   // Add the kernel $kernel1->addKernel($kernel2);   // Apply filter from second attached kernel $imagick->filter($kernel1->separate()[1]); header("Content-Type: image/jpg"); echo $imagick->getImageBlob(); ?> |
Output:
Program 2:
<?php   // Create a new imagick object $imagick = new Imagick(   $matrix1 = [     [-1, -1, -1],     [4, 4, 4],     [1, 1, 1], ];   $matrix2 = [     [-1, 0, 0],     [0, 0, 1],     [-1, 0, 1], ];   $matrix3 = [     [-1, 1, 0],     [0, 0, 1],     [-1, 0, 1], ];   $matrix4 = [     [0, 1, 0],     [0, 0, 1],     [-1, 0, 1], ];   // Create ImagickKernel objects from matrices $kernel1 = ImagickKernel::fromMatrix($matrix1); $kernel2 = ImagickKernel::fromMatrix($matrix2); $kernel3 = ImagickKernel::fromMatrix($matrix3); $kernel4 = ImagickKernel::fromMatrix($matrix4);   // Add the kernels $kernel1->addKernel($kernel2); $kernel1->addKernel($kernel3); $kernel1->addKernel($kernel4);   $kernelList = $kernel1->separate();   echo 'Total number of attached kernels are: '; echo count($kernelList); ?> |
Output:
Total number of attached kernels are: 4
Reference: https://www.php.net/manual/en/imagickkernel.addkernel.php
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