What is the primary purpose of using gels in lighting?

Using gels in lighting is primarily for changing color. Gels are transparent colored materials that are placed in front of lights to alter the hue of the illumination. This technique allows cinematographers and lighting designers to achieve specific color effects, match the color temperature of different light sources, or create mood and atmosphere in a scene. By applying gels, it is possible to simulate various lighting conditions, enhance the visual impact of a scene, or provide character to the lighting design.

While controlling brightness, diffusing light, and enhancing focus are important aspects of lighting design, those functions are typically performed by different tools and methods, such as dimmers for brightness, diffusion materials for softening light, and lenses or flags for focus. The distinctive function of gels lies in their ability to modify color, making them an essential part of achieving the desired look in film, television, and theater productions.