Gmagick::setsamplingfactors (PECL gmagick >= Unknown)Gmagick::setsamplingfactors — Sets the image sampling factors 说明 public Gmagick::setsamplingfactors(array $factors): Gmagick Sets the image sampling factors. 参数 factors An array of floats representing the sampling factor for each color component (in RGB order). 返回值 The Gmagick object. 错误/异常 错误时抛出 GmagickException。