PHP Manual Function Reference Image Processing and Generation Gmagick Gmagick Gmagick::setimagegamma Gmagick::setimageformat Gmagick::setimagegreenprimary Gmagick::setimagegamma (PECL gmagick >= Unknown)Gmagick::setimagegamma — Sets the image gamma Description public Gmagick Gmagick::setimagegamma ( float $gamma ) Sets the image gamma. Parameters gamma The image gamma. Return Values The Gmagick object on success Errors/Exceptions Throws an GmagickException on error.