Gets the extrema for the image

# Gmagick::getimageextrema

(PECL gmagick >= Unknown)

Gmagick::getimageextrema — Gets the extrema for the image

### Description

public Gmagick::getimageextrema(): array

Returns an associative array with the keys "min" and "max". Throws an GmagickException on error.

### Parameters

This function has no parameters.

### Return Values

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

### Errors/Exceptions

Throws an GmagickException on error.

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