PHP Manual
Imagick
Applies a custom convolution kernel to the image

Imagick::filter

(PECL imagick 3 >= 3.3.0)

Imagick::filter — Applies a custom convolution kernel to the image

Warning

This function has been DEPRECATED as of Imagick 3.4.4. Relying on this function is highly discouraged.

Description

public Imagick::filter(ImagickKernel $ImagickKernel, int $channel = Imagick::CHANNEL_UNDEFINED): bool

Applies a custom convolution kernel to the image.

Parameters

ImagickKernel: An instance of ImagickKernel that represents either a single kernel or a linked series of kernels.
channel: Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants

Return Values

Returns true on success.

Examples

Example #1 Imagick::filter()

<?php
function filter($imagePath) {
$imagick = new \Imagick(realpath($imagePath));
$matrix = [
[-1, 0, -1],
[0, 5, 0],
[-1, 0, -1],
];

$kernel = \ImagickKernel::fromMatrix($matrix);
$strength = 0.5;
$kernel->scale($strength, \Imagick::NORMALIZE_KERNEL_VALUE);
$kernel->addUnityKernel(1 - $strength);

$imagick->filter($kernel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}

?>