Imagick::filter()

(No version information available, might only be in Git)

Description

说明

publicImagick::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。

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();
}
?>

-----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()！';
}

-----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