Even a "black and white" picture has a color. In the olden days, you'd choose warm or cool in your printing paper and maybe apply a toning bath at the end. Nowadays, it's done in post. Even if you don't "do" anything, your picture has a tone (no tone is a tone ... ). Why do you choose what you choose? For example, what's the difference between this: ... and this: Why would (do!) you choose one tone or color over another?