Imagick::filter

(PECL imagick 3 >= 3.3.0)

Imagick::filter — Description

警告

此函數(shù)在 Imagick 3.4.4 中被廢棄，強(qiáng)烈建議不要應(yīng)用此函數(shù)。

說明

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

Applies a custom convolution kernel to the image.

參數(shù)

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. 缺省為Imagick::CHANNEL_DEFAULT. 參考此通道常數(shù)列表

返回值

成功時(shí)返回 true。

范例

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();
}

?>