Imagick::filter

(PECL imagick 3 >= 3.3.0)

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

警告

此函数在 Imagick 3.4.4 中被废弃，强烈建议不要应用此函数。

说明

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

Applies a custom convolution kernel to the image.

参数

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. 缺省为Imagick::CHANNEL_DEFAULT. 参考此通道常数列表

返回值

成功时返回 true。

示例

示例 #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();
}

?>