Have a new 21" imac . When viewing images in PS5 monitor dims after a few minutes, to save energy, if nothing happens. As it's supposed to. A funny thing about it is, I really like how some images look when that happens. For instance, the light on a tree branch 'almost glows in the dark'. An effect I'd like to get and save, but don't know how. Does anyone know how to achieve this dimming effect ? Thanks for reading.