Contrast Prompts: High Key, Low Key and Flat - Nano Banana 2

The photographic vocabulary here is unusually precise, which is why it survives the trip through a prompt intact. High key means the whole image sits in the upper tones — bright, airy, almost no true black, shadows rendered as pale grey. Low key means the opposite: most of the frame is dark, with small, deliberate areas of light. These two terms move an image further than any amount of “dramatic” or “moody”, because they describe where the tones actually live rather than how the picture ought to feel.

Between them sit the descriptions of range itself. “High contrast, crushed blacks, blown highlights” gives you a hard, graphic image with detail sacrificed at both ends. “Low contrast, soft grey tones, no pure black” gives the washed, gentle look of a misty morning or a faded print. “Flat lighting” is a related but distinct instruction, since it removes the contrast by removing the shadow, and you get an evenly lit subject with very little modelling.

You can say this directly and it holds up: “the figure brightly lit against a deep shadowed background, the rest of the room falling to near black” is an instruction about where the attention goes as much as about tone. That is usually a more effective sentence than any request for the subject to be prominent or the focus of the image.