PHP | Imagick filter() Function
Last Updated :
25 Jul, 2019
The Imagick::filter() function is an inbuilt function in PHP which is used to apply custom convolution kernel to the image. A kernel, convolution matrix, or mask is a small matrix. It is used for blur, sharpen, embossing, edge detection, and many more.
Syntax:
bool Imagick::filter( $ImagickKernel, $channel = Imagick::CHANNEL_UNDEFINED )
Parameters: This function accepts two parameters as mentioned above and described below:
- $ImagickKernel: It is a kernel or a linked series of multiple kernels that are used to be apply on the image.
- $channel: It is a constant that is used on basis of the modes. It is of integer type and the default value of channel is Imagick::CHANNEL_DEFAULT.
Return Value: It returns true when the filter to the image is successfully applied.
Below program illustrates the Imagick::filter() function in PHP:
Program:
<?php
$imagick = new Imagick(
$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();
?>
|
Output:
Reference: https://www.php.net/manual/en/imagick.filter.php
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