Imagick::filter

    (PECL imagick 3 >= 3.3.0)

    Imagick::filter — Applies 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

    publicImagick::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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