The provided example is wrong. Here's a correct sample:
$matrix = [[1,-1,1],[-1,1,-1],[1,-1,1]];
$kernel = \ImagickKernel::fromMatrix($matrix);
$imagick = new Imagick();
$imagick->readimage($file.'/z.png');
$imagick->convolveImage ($kernel);
$imagick->writeimage('convolve.png');
$imagick->clear();
$imagick->destroy();
Imagick::convolveImage
(PECL imagick 2.0.0)
Imagick::convolveImage — Applies a custom convolution kernel to the image
說明
bool Imagick::convolveImage
( array
$kernel
[, int $channel = Imagick::CHANNEL_ALL
] )Applies a custom convolution kernel to the image.
參數
-
kernel -
The convolution kernel
-
channel -
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
回傳值
成功時回傳 TRUE。
錯誤/例外
錯誤時拋出 ImagickException。
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User Contributed Notes 2 notes
ahmed at zigzapps dot com ¶
4 years ago
peter at musicalsaw dot com ¶
10 years ago
Example of convolveImage:
<?php
// run an edge detection filter on an image
$image = new imagick( "diana.png" );
$edgeArray = array(-1,-1,-1,-1,8,-1,-1,-1,-1);
$image->convolveImage ($edgeArray);
$image->thresholdImage(1);
header('Content-type: image/png');
echo $image;
?>
