The proof print is a quick print used for testing the color rendering of your design without having to waste a high amount of ink.
When you use the Alto effect, the proof print only consists of the color layers without any elevation.
When you use the Brila effect, the proof print consists of the white undercoat, the color layers, and 2 layers of varnish ink. Thus, you can also check which areas are covered with varnish ink. The total height of a Brila proof print is 0.03mm.
NOTE
If your design consists of large grainy areas, the color rendering of the proof print may differ from the color rendering of your final printed output.