# Imagick::charcoalImage

(PECL imagick 2, PECL imagick 3)

Imagick::charcoalImage — Simulates a charcoal drawing

### 说明

public Imagick::charcoalImage(float `$radius`, float `$sigma`): bool

Simulates a charcoal drawing.

### 参数

`radius`

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

`sigma`

  The standard deviation of the Gaussian, in pixels

### 返回值

成功时返回 `true`。

### 示例

示例 #1 Imagick::charcoalImage()

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