What is the role of flagging in lighting?

The role of flagging in lighting primarily revolves around controlling the way light is focused and shaped in a theatrical setting. Flagging involves the use of flags—opaque or semi-opaque materials—that are placed in front of light sources to block or diffuse light, thereby allowing designers to precisely control the intensity and direction of the illumination. This helps in crafting specific atmospheres and highlighting particular areas on stage while avoiding unwanted spillover of light in other areas.

It is important to note that flagging is distinct from setting up lighting cues or indicating positions for actors. Those processes involve different elements of stage management and production work that relate to timing and actor placement rather than the manipulation of light itself. Similarly, creating a backdrop pertains to scenic design rather than the direct management of lighting effects. Thus, the focus on where light is directed and how it interacts with the stage environment is the essence of flagging.