Imagine you have shot a sunset and now wish to put a graduated filter over it. Pull the filter down and hit the O key to see where the filter has fallen. As the translucent colour is red it will be very difficult to see versus the sunset. To change the colour press Shift O and the colour will cycle red-green-white-black.
![Sunset](https://cdn.myportfolio.com/a3ec7ee4dfee20939f94bb9bd248ce30/f7d45c25-94ea-488f-a30d-77610571bf90_rw_1920.png?h=a20cb699651c72955a962216cab38b14)
Sunset
![Sunset with graduated filter](https://cdn.myportfolio.com/a3ec7ee4dfee20939f94bb9bd248ce30/957ef763-74ca-461c-bd35-af7056e5475d_rw_1920.png?h=bbb25301a5c216e782a3c779a34b74cd)
Sunset with graduated filter
![Shift O to change the colour](https://cdn.myportfolio.com/a3ec7ee4dfee20939f94bb9bd248ce30/38982f38-2e3c-4a06-8245-65e3fa8deaa9_rw_1920.png?h=3f6b510dcd52e2b246543ed59441541f)