Simulates a pencil sketch

# Imagick::sketchImage

(PECL imagick 2, PECL imagick 3)

Imagick::sketchImage — Simulates a pencil sketch

### 说明

public function Imagick::sketchImage(float `$radius`, float `$sigma`, float `$angle`): bool

Simulates a pencil sketch. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and Imagick::sketchImage() selects a suitable radius for you. Angle gives the angle of the blurring motion. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

### 参数

`radius`

  The radius of the Gaussian, in pixels, not counting the center pixel

`sigma`

  The standard deviation of the Gaussian, in pixels.

`angle`

  Apply the effect along this angle.

### 返回值

成功时返回 `true`。

### 示例

示例 #1 Imagick::sketchImage()

    <?php
    function sketchImage($imagePath, $radius, $sigma, $angle) {
        $imagick = new \Imagick(realpath($imagePath));
        $imagick->sketchimage($radius, $sigma, $angle);
        header("Content-Type: image/jpg");
        echo $imagick->getImageBlob();
    }

    ?>

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