title: Apply grayscale effect to a javafx application
body: <p>Is it possible to apply an effect to the whole application to change its color? I would like to apply a grayscale for example.</p>
  
  <p>I have seen the <a href="https://docs.oracle.com/javase/8/javafx/api/javafx/scene/effect/ColorAdjust.html" rel="nofollow noreferrer">ColorAdjust</a> effect but i'm not sure i can use it for a grayscale effect.</p>