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Imagick::filter — Description
$ImagickKernel
[, int $CHANNEL
= Imagick::CHANNEL_DEFAULT
] )Applies a custom convolution kernel to the image.
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
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 ();
}
?>