(PECL imagick 2.0.0)
Imagick::setImageBias — Sets the image bias for any method that convolves an image
$bias
   )Sets the image bias for any method that convolves an image (e.g. Imagick::ConvolveImage()).
bias
   Restituisce TRUE in caso di successo.
  
Lancia una ImagickException in caso di errore.