Editing Green Screen- Mask Footage

Yesterday we filmed our final scene where the mask comes towards the camera, creating the idea that even the audience have to conform to society by wearing a mask. We used the green screen so that when it came to editing we could change it to a pitch black background. This would create the idea that the protagonists ideal world, where everyone takes their masks off, wasn't possible because society is dark and no one can truly be who they really are.