Imagick::filter
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Imagick::filter — Description
说明
public
Imagick::filter (
ImagickKernel
$ImagickKernel [,
int $channel = Imagick::CHANNEL_UNDEFINED ] ) :
bool
Applies a custom convolution kernel to the image.
参数
-
ImagickKernel -
An instance of ImagickKernel that represents either a single kernel or a linked series of kernels.
-
channel -
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. 缺省为
Imagick::CHANNEL_DEFAULT. 参考此 通道常数列表
返回值
成功时返回 TRUE。
范例
Example #1 Imagick::filter()
<?php
function filter($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();
}
?>
