Gets the extrema for the image

# Gmagick::getimageextrema

(PECL gmagick >= Unknown)

Gmagick::getimageextrema — Gets the extrema for the image

### 说明

public function Gmagick::getimageextrema(): array

Returns an associative array with the keys "min" and "max". 错误时抛出 GmagickException。

### 参数

此函数没有参数。

### 返回值

Returns an associative array with the keys "min" and "max".

### 错误／异常

错误时抛出 GmagickException。

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