Imagick::filter

(PECL imagick 3 >= 3.3.0)

Imagick::filterApplies a custom convolution kernel to the image

Warning

This function has been DEPRECATED as of Imagick 3.4.4. Relying on this function is highly discouraged.

Description

public Imagick::filter(ImagickKernel $ImagickKernel, int $channel = Imagick::CHANNEL_UNDEFINED): bool

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

Returns true on success.

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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User Contributed Notes 2 notes

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0
wangzh at dingl dot me
6 years ago
-----Imagick  3.4.3  &&  ImageMagick 7.0.6 

-----why cannot find filter method?????

if (!method_exists(Imagick, 'filter')) {
    echo 'undefined filter()!';
} else {
    echo 'defined filter()!';
}
up
0
wangzh at dingl dot me
6 years ago
-----Imagick::filter cannot work!

-----suse linux server   ,   imagick module version 3.4.3

-----run Example #1 Imagick::filter()  , there is no result!  where is problem?

thank you for your answer!

Alex
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