How to know the slope of the green when chipping whether it is sloping towards you or away from you?
You can switch to reverse view, then move the aim arrow back and forth between the hole (and past the hole) and the ball; it will show the elevation as you move it, so you can determine the amount and severity of the slope.
The color. Leon's way gives you the exact drop/rise wherever the aimer is placed. The colors tell you which way the slope goes overall. The ball rolls from blue (high) to red (low.)