Applies a custom convolution kernel to the image

# Imagick::convolveImage

(PECL imagick 2, PECL imagick 3)

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

### 说明

public function Imagick::convolveImage(array `$kernel`, int `$channel` = Imagick::CHANNEL_DEFAULT): bool

Applies a custom convolution kernel to the image.

### 参数

`kernel`

  The convolution kernel

`channel`

  Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

### 返回值

成功时返回 `true`。

### 错误／异常

错误时抛出 ImagickException。

### 示例

示例 #1 Imagick::convolveImage()

    <?php
    function convolveImage($imagePath, $bias, $kernelMatrix) {
        $imagick = new \Imagick(realpath($imagePath));
        //$edgeFindingKernel = [-1, -1, -1, -1, 8, -1, -1, -1, -1,];
        $imagick->setImageBias($bias * \Imagick::getQuantum());
        $imagick->convolveImage($kernelMatrix);
        header("Content-Type: image/jpg");
        echo $imagick->getImageBlob();
    }

    ?>

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