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

Imagick::convolveImageApplies a custom convolution kernel to the image

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.