(PECL gmagick >= Unknown)
Gmagick::setimagegamma — Sets the image gamma
public Gmagick::setimagegamma(float $gamma): Gmagick
Sets the image gamma.
gammaThe image gamma.
The Gmagick object.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setimagegamma.php