“Flat light” usually means light that gives even illumination but very little shadow, contrast, or sense of depth. Images can look dull because the light doesn’t help reveal shape or texture.

Outdoors, flat light is commonly associated with broad, diffuse illumination such as overcast conditions, and it can also be an issue when the sun is high and not creating pleasing directional shadows. Many photographers prefer lower-angle light near sunrise or sunset because it adds shape, texture, and color.

In the studio, flat light comes from setups that minimize shadows and contrast, often with large diffused light sources placed close to the camera axis.

To counter flat light, use more directional light so the subject creates shadows on itself. Outdoors, shoot earlier or later in the day, or change your angle to emphasize side-lighting. In controlled lighting, move the light off-axis, reduce diffusion, or increase contrast.

Flat light is not always bad. It can be useful for macro, close-up work, or any situation where you want soft, even illumination and minimal shadows. As with most lighting, whether it works depends on your subject and creative intent.