As the hero rides into the sunset, the screen 'fades to black'. [=the image gradually changes until the screen is completely black]
His voice 'faded' off into a whisper. = His voice 'faded' to a whisper.
We watched the ship gradually 'fade' from view as it sailed away.
(..) I scarred you for life. See, that's the thing, Shen. Scars heal. No, they don't. Wounds heal. Oh, yeah. What do scars do? They fade, I guess? - I don't care what scars do. - You should, Shen. You gotta let go of that stuff from the past, 'cause it just doesn't matter. The only thing that matters (..)2011 Kung Fu Panda 2