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 ();
}

 ?>