What is the primary function of the 'fill light' in three-point lighting?

The primary function of the fill light in three-point lighting is indeed to soften harsh shadows created by the key light. In a typical three-point lighting setup, the key light serves as the main light source, establishing the overall illumination and directing focus toward the subject. However, this key light can produce strong shadows due to its intensity and positioning.

The fill light is strategically placed to counterbalance these shadows without creating additional harsh lighting. By illuminating the shadowed areas, it helps create a more even and flattering light on the subject, enhancing the overall visual appeal while maintaining depth. This balance is crucial in many photographic and filmmaking scenarios, as it allows for a more three-dimensional appearance without losing important details in shadowed regions.

This role of the fill light is essential for achieving a polished and professional look in digital design, as it enhances the clarity and visibility of the subject without overwhelming it with light.