Bezier curves and Paint bucket tool.

For my campaign I used photography from google. I found one that I liked, but I wanted to change the background:

I wanted a black background, to be consistent with the second image on the poster.

So, I selected the "Bezier curves" tool and I started to select around the figure.

I continued around all the figure, until I got back at the starting point. This way, my line was closed, which made it a shape.

To transform from a bezier to a selection I clicked "paths" - > "make selection". Now I had a selection of the man.

To change the background I changed the selection from the man to the background with Control + I. Now I had all my background selected.

I tried to change the color with a brush, but it was taking too long and it wasn't the right tool. So I switched to the "Paint bucket" tool and I chose black as a colour.