Thanks for your help. I have finally had time to test this in a new project and I still can’t get it to work properly. I have antialiasing off and have used r.Upscale.Quality 0. This works fine and I can see some nice jaggies. The problem is with the screen percentage command. It just will not work. I have no idea what I’m doing wrong. I’m on 5.1.1 could it be a problem with the version? Do you think it will work agian in 5.2?