Imagick::convolveImage

(PECL imagick 2.0.0)

Imagick::convolveImageApplies a custom convolution kernel to the image

Description

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

Applies a custom convolution kernel to the image.

Parameters

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.

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.

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User Contributed Notes 1 note

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peter at musicalsaw dot com
1 year 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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