Sets the image gamma

# Gmagick::setimagegamma

(PECL gmagick >= Unknown)

Gmagick::setimagegamma — Sets the image gamma

### Description

public Gmagick::setimagegamma(float `$gamma`): Gmagick

Sets the image gamma.

### Parameters

`gamma`
  The image gamma.

### Return Values

The Gmagick object.

### Errors/Exceptions

Throws an GmagickException on error.

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