Simulates a charcoal drawing

# Gmagick::charcoalimage

(PECL gmagick >= Unknown)

Gmagick::charcoalimage — Simulates a charcoal drawing

### 说明

public function Gmagick::charcoalimage(float `$radius`, float `$sigma`): Gmagick

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

The Gmagick object with charcoal simulation.

### 错误／异常

错误时抛出 GmagickException。

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