Imagick::filter

    (PECL imagick 3 >= 3.3.0)

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

    警告

    此函数在 Imagick 3.4.4 中被 废弃，强烈建议不要应用此函数。

    说明

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

    Applies a custom convolution kernel to the image.

    参数

    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. 缺省为Imagick::CHANNEL_DEFAULT. 参考此 通道常数列表

    返回值

    成功时返回 true。

    示例

    示例 #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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