The thing is that I used to do this with good results https://www.youtube.com/watch?v=f7djg8JOoF8 but I formated my computer, reinstalled and now, using exactly the same picture, scale (0.80) and resolution the result is worse https://youtu.be/JKE0hXGuXSE
And this loss of image quality happens even if I just move the image. It is quite weird.