(PECL imagick 2.0.0)
Imagick::convolveImage — Applies a custom convolution kernel to the image
$kernel
[, int $channel = Imagick::CHANNEL_DEFAULT
] ) : boolApplies a custom convolution kernel to the image.
kernelThe convolution kernel
channelProvide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
成功时返回 TRUE。
错误时抛出 ImagickException。
Example #1 Imagick::convolveImage()
<?php
function convolveImage($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();
}
?>
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;
?>