Today on the Scottish Photography Community Facebook page there was some chat about how to fix an image where the sky was too dark after a grad had been overly used on the sky. There are several ways to do this and one of the topics that came up was layers and layer masks. Someone wanted to know how to do this so here goes (bare in mind this was a rush job that I only spent 10 mins on!)
Unlike an eraser, the picture is still there and if you make a mistake you can paint it back in by using a white paint brush. As they say "white reveals, black conceals". It takes a bit of time to get decent at this and also figuring out which layers need to be on top etc. Just play about with it and soon you will see that you can have all kinds of layers and layer masks in a single picture which really makes for some interesting results.