Imagick::filter

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Imagick::filter — Description

说明

public void Imagick::filter ( ImagickKernel $ImagickKernel [, int $CHANNEL = Imagick::CHANNEL_DEFAULT ] )

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

范例

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();
}

?>

User Contributed Notes

wangzh at dingl dot me 03-Aug-2017 08:50


-----Imagick  3.4.3  &&  ImageMagick 7.0.6  



-----why cannot find filter method????? 



if (!method_exists(Imagick, 'filter')) {

    echo 'undefined filter()！';

} else {

    echo 'defined filter()！';

}

wangzh at dingl dot me 03-Aug-2017 07:21


-----Imagick::filter cannot work!



-----suse linux server   ,   imagick module version 3.4.3



-----run Example #1 Imagick::filter()  , there is no result!  where is problem?



thank you for your answer!



Alex