Separates a channel from the image

# Gmagick::separateimagechannel

(PECL gmagick >= Unknown)

Gmagick::separateimagechannel — Separates a channel from the image

### 说明

public function Gmagick::separateimagechannel(int `$channel`): Gmagick

Separates a channel from the image and returns a grayscale image. A channel is a particular color component of each pixel in the image.

### 参数

`channel`
  One of the Channel constant (`Gmagick::CHANNEL_*`).

### 返回值

The Gmagick object.

### 错误／异常

错误时抛出 GmagickException。

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