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Imagick::filter

(PECL imagick 3 >= 3.3.0)

Imagick::filter — Applies a custom convolution kernel to the image

Avviso

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

Descrizione

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

Applies a custom convolution kernel to the image.

Elenco dei parametri

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. Per default è Imagick::CHANNEL_DEFAULT. Fare riferimento a questa lista di costanti di canale

Valori restituiti

Restituisce true in caso di successo.

Esempi

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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wangzh at dingl dot me ¶

7 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()！';
}

down

wangzh at dingl dot me ¶

7 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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