(PECL imagick 2, PECL imagick 3)
Imagick::convolveImage — Applies a custom convolution kernel to the image
Applies 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.
Повертає true в разі успіху.
Кидає ImagickException в разі помилки.
Приклад #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();
}
?>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();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;
?>