Imagick::filter

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Imagick::filter — Description

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

Applies a custom convolution kernel to the image.

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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. ȱʡΪImagick::CHANNEL_DEFAULT. �ο��� ͨ�������б�

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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();
}

?>