Pessimism idiom - opposite of rose-tinted glasses?

You can look on the black side, take a grim (or black, or dim) view of things and consider that the outlook is bleak and that the {prospect is / prospects are} grim or things aren't looking good.

While it appears the idiom does not exist, you could make quite the play on words by describing someone "seeing through half-empty glasses."

On a more serious note, most English-speaking people would likely understand if you described someone who "sees the world as half-empty" or "sees (x) as a half-empty glass." I can't say I have ever heard it used before in this way, though.

Alternatively, describe someone who sees the world as bleak or grey when they are not wearing rose-tinted glasses. Unfortunately this will only work in the negative.