(PECL imagick 3 >= 3.3.0)
Imagick::filter — Applies a custom convolution kernel to the image
此函数在 Imagick 3.4.4 中被 废弃，强烈建议不要应用此函数。
$ImagickKernel, int $channel = Imagick::CHANNEL_UNDEFINED): boolApplies a custom convolution kernel to the image.
ImagickKernelAn instance of ImagickKernel that represents either a single kernel or a linked series of kernels.
channel
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. 缺省为Imagick::CHANNEL_DEFAULT.
参考此 通道常数列表
成功时返回 true。
示例 #1 Imagick::filter()
<?php
function filter($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();
}
?>