Imagick::convolveImage

(PECL imagick 2.0.0)

Imagick::convolveImageApplies a custom convolution kernel to the image

Beschreibung

Imagick::convolveImage ( array $kernel [, int $channel = Imagick::CHANNEL_DEFAULT ] ) : bool

Applies a custom convolution kernel to the image.

Parameter-Liste

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.

R├╝ckgabewerte

Liefert TRUE bei Erfolg.

Fehler/Exceptions

Wirft ImagickException bei Fehlern.

Beispiele

Beispiel #1 Imagick::convolveImage()

<?php
function convolveImage($imagePath$bias$kernelMatrix) {
    
$imagick = new \Imagick(realpath($imagePath));    
    
//$edgeFindingKernel = [-1, -1, -1, -1, 8, -1, -1, -1, -1,];
    
$imagick->setImageBias($bias * \Imagick::getQuantum());
    
$imagick->convolveImage($kernelMatrix);
    
header("Content-Type: image/jpg");
    echo 
$imagick->getImageBlob();
}

?>

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User Contributed Notes 2 notes

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0
ahmed at zigzapps dot com
1 month ago
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();
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0
peter at musicalsaw dot com
6 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;
?>
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