Imagick::filter
Imagick::filter
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Imagick::filter — Description
Description
public void Imagick::filter ( ImagickKernel $ImagickKernel [, int $CHANNEL = Imagick::CHANNEL_DEFAULT ] )
Applies a custom convolution kernel to the image.
Parameters
-
ImagickKernel
-
An instance of ImagickKernel that represents either a single kernel or a linked series of kernels.
-
CHANNEL
-
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. Defaults to
Imagick::CHANNEL_DEFAULT
. Refer to this list of channel constants
Return Values
Examples
Example #1 Imagick::filter()
<?php function filter($imagePath) { $imagick = new \Imagick(realpath($imagePath)); $matrix = [ [-1, 0, -1], [0, 5, 0], [-1, 0, -1], ]; $kernel = \ImagickKernel::fromMatrix($matrix); $strength = 0.5; $kernel->scale($strength, \Imagick::NORMALIZE_KERNEL_VALUE); $kernel->addUnityKernel(1 - $strength); $imagick->filter($kernel); header("Content-Type: image/jpg"); echo $imagick->getImageBlob(); } ?>
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https://secure.php.net/manual/en/imagick.filter.php